Provide GCRYPT_VERSION_NUMBER macro, add build info to the binary.
* src/gcrypt.h.in (GCRYPT_VERSION_NUMBER): New. * configure.ac (VERSION_NUMBER): New ac_subst. * src/global.c (_gcry_vcontrol): Move call to above function ... (gcry_check_version): .. here. * configure.ac (BUILD_REVISION, BUILD_FILEVERSION) (BUILD_TIMESTAMP): Define on all platforms. * compat/compat.c (_gcry_compat_identification): Include revision and timestamp.