Cray: Implement Fortran compiler version detection (#15845)

We already recognize the Cray Fortran compiler id.  Extract the version
number using the same predefined macros we already use for Cray C and
C++ compilers.

Modules/CMakeFortranCompilerId.F.in

@@ -45,6 +45,8 @@
 # define COMPILER_VERSION_PATCH HEX(__SUNPRO_F90    & 0xF)
 #elif defined(_CRAYFTN)
         PRINT *, 'INFO:compiler[Cray]'
+# define COMPILER_VERSION_MAJOR DEC(_RELEASE_MAJOR)
+# define COMPILER_VERSION_MINOR DEC(_RELEASE_MINOR)
 #elif defined(__G95__)
         PRINT *, 'INFO:compiler[G95]'
 # define COMPILER_VERSION_MAJOR DEC(__G95__)