cmake HAVE_BSWAP_16 examples

Kitware/VTK ThirdParty/lzma/vtklzma/CMakeLists.txt :27 

check_symbol_exists(HAVE_BSWAP_16 "byteswap.h" bswap_16)

hatari/hatari CMakeLists.txt :226 

check_symbol_exists(bswap_16 "byteswap.h" HAVE_BSWAP_16)