Fortran: Detect XL and VisualAge compiler versions

Port logic from the "Compiler/XL-*-DetermineCompiler" and
"Compiler/VisualAge-*-DetermineCompiler" modules into
"CMakeFortranCompilerId.F.in".

Modules/CMakeFortranCompilerId.F.in

@@ -68,8 +68,14 @@
         PRINT *, 'INFO:compiler[zOS]'
 # elif __IBMC__ >= 800
         PRINT *, 'INFO:compiler[XL]'
+#  define COMPILER_VERSION_MAJOR DEC(__IBMC__/100)
+#  define COMPILER_VERSION_MINOR DEC(__IBMC__/10 % 10)
+#  define COMPILER_VERSION_PATCH DEC(__IBMC__    % 10)
 # else
         PRINT *, 'INFO:compiler[VisualAge]'
+#  define COMPILER_VERSION_MAJOR DEC(__IBMC__/100)
+#  define COMPILER_VERSION_MINOR DEC(__IBMC__/10 % 10)
+#  define COMPILER_VERSION_PATCH DEC(__IBMC__    % 10)
 # endif
 #elif defined(__PGI)
         PRINT *, 'INFO:compiler[PGI]'