Compile failure after GCC 7.3.0 version

### Env:
LMbench 3

### Error Message:

`#make results
make[1]: Entering directory '/root/lmbench3/src'
gcc -O -DRUSAGE -DHAVE_uint=1 -DHAVE_int64_t=1 -DHAVE_DRAND48 -DHAVE_SCHED_SETAFFINITY=1 -o ../bin/x86_64-linux-gnu/disk disk.c ../bin/x86_64-linux- gnu/lmbench.a -lm
/usr/bin/ld: /tmp/ccvsfTiW.o: in function `seekto':
disk.c:(.text+0x37): undefined reference to `llseek'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:323: ../bin/x86_64-linux-gnu/disk] Error 1
make[1]: Leaving directory '/root/lmbench3/src'
make: *** [Makefile:114: lmbench] Error 2`

#define BIGSEEK (1<<30)
int
seekto(int fd, uint64 off)
{
#ifdef __linux__
extern loff_t **llseek**(int, loff_t, int);

if (**llseek**(fd, (loff_t)off, SEEK_SET) == (loff_t)-1) {
return(-1);
}
return (0);
#else
uint64 here = 0;
lseek(fd, 0, 0);
while ((uint64)(off - here) > (uint64)BIGSEEK) {
if (lseek(fd, BIGSEEK, SEEK_CUR) == -1) break;
here += BIGSEEK;
}
assert((uint64)(off - here) <= (uint64)BIGSEEK);
if (lseek(fd, (int)(off - here), SEEK_CUR) == -1) return (-1);
return (0);
#endif
}

`root@iZbp176gmwpuh1u0d4zudlZ:~# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.3.0-17ubuntu1~20.04' --with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-9 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-9-HskZEa/gcc-9-9.3.0/debian/tmp-nvptx/usr,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)
`

### Analysis:
Check disk.c, line292, found seekto is using llseek funtion. After GCC 7.3.0 version, llseek is replaced by lseek64. so replace have fixed this issue.