fix(cmake): check if CMAKE_CXX_COMPILER_VERSION is defined
fix(cmake): check if CMAKE_CXX_COMPILER_VERSION is defined

jpfr/open62541,open62541/open62541,jpfr/open62541,JGrothoff/open62541,JGrothoff/open62541,jpfr/open62541,jpfr/open62541,JGrothoff/open62541,open62541/open62541,open62541/open62541,JGrothoff/open62541,open62541/open62541