Build failure of 0.4.7 on ppc64el and s390x

Hi! I help maintain this package for Debian. It builds fine on many platforms, but on ppc64el and s390x there is build problems for the embedded C code.

For ppc64el:

https://ci.debian.net/packages/g/golang-github-google-go-tpm-tools/testing/ppc64el/68775364/

```
...
63s os
63s internal/fmtsort
63s encoding/binary
63s github.com/google/go-tpm-tools/simulator/internal
63s # github.com/google/go-tpm-tools/simulator/internal
63s In file included from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Tpm.h:47,
63s from src/github.com/google/go-tpm-tools/simulator/internal/internal_cgo.go:47:
63s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/LibSupport.h:54:9: error: #error Unable to determine RADIX_BITS from compiler environment
63s 54 | # error Unable to determine RADIX_BITS from compiler environment
63s | ^~~~~
63s In file included from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Global.h:82,
63s from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Tpm.h:52:
63s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/BnValues.h:66:3: error: #error "Unsupported radix"
63s 66 | # error "Unsupported radix"
63s | ^~~~~
63s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/BnValues.h:312:9: error: #error "RADIX_BITS must either be 32 or 64"
63s 312 | # error "RADIX_BITS must either be 32 or 64"
63s | ^~~~~
63s In file included from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/BnValues.h:317:
63s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Ossl/TpmToOsslMath.h:73:5: error: #error Ossl library is using different radix
63s 73 | # error Ossl library is using different radix
63s | ^~~~~
63s In file included from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Global.h:85:
63s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/CryptRand.h:67:30: error: division by zero in #if
63s 67 | #if ((DRBG_KEY_SIZE_BITS % RADIX_BITS) != 0) \
63s | ^
63s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/CryptRand.h:69:2: error: #error "Key size and IV for DRBG must be even multiples of the radix"
63s 69 | #error "Key size and IV for DRBG must be even multiples of the radix"
63s | ^~~~~
63s golang.org/x/sys/unix
63s fmt
63s crypto/internal/sysrand
63s net
...
```

For s390x:

https://ci.debian.net/packages/g/golang-github-google-go-tpm-tools/testing/s390x/68775547/

```
...
time
68s internal/syscall/unix
68s github.com/google/go-tpm-tools/simulator/internal
68s # github.com/google/go-tpm-tools/simulator/internal
68s In file included from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Tpm.h:47,
68s from src/github.com/google/go-tpm-tools/simulator/internal/internal_cgo.go:47:
68s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/LibSupport.h:54:9: error: #error Unable to determine RADIX_BITS from compiler environment
68s 54 | # error Unable to determine RADIX_BITS from compiler environment
68s | ^~~~~
68s In file included from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Global.h:82,
68s from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Tpm.h:52:
68s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/BnValues.h:66:3: error: #error "Unsupported radix"
68s 66 | # error "Unsupported radix"
68s | ^~~~~
68s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/BnValues.h:312:9: error: #error "RADIX_BITS must either be 32 or 64"
68s 312 | # error "RADIX_BITS must either be 32 or 64"
68s | ^~~~~
68s In file included from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/BnValues.h:317:
68s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Ossl/TpmToOsslMath.h:73:5: error: #error Ossl library is using different radix
68s 73 | # error Ossl library is using different radix
68s | ^~~~~
68s In file included from src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/Global.h:85:
68s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/CryptRand.h:67:30: error: division by zero in #if
68s 67 | #if ((DRBG_KEY_SIZE_BITS % RADIX_BITS) != 0) \
68s | ^
68s src/github.com/google/go-tpm-tools/simulator/ms-tpm-20-ref/TPMCmd/tpm/include/CryptRand.h:69:2: error: #error "Key size and IV for DRBG must be even multiples of the radix"
68s 69 | #error "Key size and IV for DRBG must be even multiples of the radix"
68s | ^~~~~
68s crypto/internal/fips140/nistec
68s context
68s internal/poll
68s io/fs
...
```

Any ideas?

Thanks,
Simon

Start by reproducing the Debian CI builds for ppc64el and s390x, then read simulator/internal/internal_cgo.go and the compiler checks in ms-tpm-20-ref/TPMCmd/tpm/include/LibSupport.h and BnValues.h. Compare the radix-related checks with TpmToOsslMath.h and CryptRand.h. Done means the simulator package builds successfully on both architectures.

Written by the indexing model from the issue text.