build CHIMERA with pcre source failed

cmake
```
cmake ../$HYPERSCAN \
-DCMAKE_INSTALL_PREFIX=$PREFIX/$HYPERSCAN \
-DCMAKE_C_COMPILER=$PREFIX/$GCC7/bin/gcc \
-DCMAKE_CXX_COMPILER=$PREFIX/$GCC7/bin/g++ \
-DCMAKE_BUILD_TYPE=Release \
-DBUILD_STATIC_AND_SHARED=yes \
-DBOOST_ROOT=$PREFIX/$BOOST \
-DFAT_RUNTIME=true \
-DBUILD_CHIMERA=true \
-Wno-dev
```

log
```
In file included from /temp/hyperscan-5.0.0/pcre/pcre_byte_order.c:50:0:
/temp/hyperscan-5.0.0/pcre/pcre_internal.h:467:2: error: #error LINK_SIZE must be either 2, 3, or 4
#error LINK_SIZE must be either 2, 3, or 4
^~~~~
```

Reproduce the reported CMake configuration with BUILD_CHIMERA=true and the supplied compiler and dependency settings. Inspect pcre/pcre_internal.h and pcre/pcre_byte_order.c around the LINK_SIZE error, then verify that a corrected configuration builds CHIMERA successfully with the PCRE source.

Written by the indexing model from the issue text.