cmake LIBSTR_HAS_PUTMSG examples

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :904 

check_library_exists(str putmsg "" LIBSTR_HAS_PUTMSG)

CTSRD-CHERI/cheribsd contrib/libpcap/CMakeLists.txt :910 

endif(LIBSTR_HAS_PUTMSG)

asset-group/5ghoul-5g-nr-attacks libs/libpcap/CMakeLists.txt :563 

check_library_exists(str putmsg "" LIBSTR_HAS_PUTMSG)

asset-group/5ghoul-5g-nr-attacks libs/libpcap/CMakeLists.txt :566 

endif(LIBSTR_HAS_PUTMSG)