cmake HAVE_SYSLOG_FUNC examples

Tinob/Ishiiruka Externals/libusb/CMakeLists.txt :104 

check_function_exists(syslog HAVE_SYSLOG_FUNC)

aidanmcb1/Citra externals/libusb/CMakeLists.txt :136 

check_function_exists(syslog HAVE_SYSLOG_FUNC)