cmake HAVE_DECL_BE64TOH examples

Bitcoin-ABC/bitcoin-abc src/config/CMakeLists.txt :44 

check_symbol_exists(be64toh ${ENDIAN_FILE} HAVE_DECL_BE64TOH)

bitcoin-sv/bitcoin-sv src/config/CMakeLists.txt :55 

check_symbol_exists(be64toh ${ENDIAN_FILE} HAVE_DECL_BE64TOH)

ngtcp2/ngtcp2 CMakeLists.txt :330 

check_symbol_exists(be64toh "endian.h" HAVE_DECL_BE64TOH)

ngtcp2/ngtcp2 CMakeLists.txt :333 

check_symbol_exists(be64toh "sys/endian.h" HAVE_DECL_BE64TOH)