cmake SOCKETXX_HAVE_STRSIGNAL examples

malaterre/GDCM Utilities/socketxx/socket++/CMakeLists.txt :7 

CHECK_FUNCTION_EXISTS(strsignal SOCKETXX_HAVE_STRSIGNAL)

InsightSoftwareConsortium/ITK Modules/ThirdParty/GDCM/src/gdcm/Utilities/socketxx/socket++/CMakeLists.txt :7 

CHECK_FUNCTION_EXISTS(strsignal SOCKETXX_HAVE_STRSIGNAL)