PGI: Fix typo in compiler version test for language standards

Modules/Compiler/PGI-CXX.cmake

@@ -3,7 +3,7 @@ __compiler_pgi(CXX)
 string(APPEND CMAKE_CXX_FLAGS_MINSIZEREL_INIT " -DNDEBUG")
 string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " -DNDEBUG")
 
-if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 12.10)
+if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 12.10)
   set(CMAKE_CXX98_STANDARD_COMPILE_OPTION  -A)
   set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION --gnu_extensions)
   if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 13.10)