Define _POSIX_C_SOURCE for crfsuite source files #159
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gcc-14 has "-Werror=implicit-function-declaration" enabled by default. crfsuite uses posix_memalign which only gets defined when _POSIX_C_SOURCE is defined, so make sure the flag is set when compiling crfsuite. On the other hand, openSUSE Tumbleweed has _POSIX_C_SOURCE defined in pyconfig.h, so you must not add "-D_POSIX_C_SOURCE" when compiling the python binding source code. So add it only for the subdir crfsuite.
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gcc-14 has "-Werror=implicit-function-declaration" enabled by default. crfsuite uses posix_memalign which only gets defined when _POSIX_C_SOURCE is defined, so make sure the flag is set when compiling crfsuite.
On the other hand, openSUSE Tumbleweed has _POSIX_C_SOURCE defined in pyconfig.h, so you must not add "-D_POSIX_C_SOURCE" when compiling the python binding source code. So add it only for the subdir crfsuite.
Fixes #158