Cray: Enable Cray compiler wrapper detection on all platforms

Previously were checking for the `__CRAYXC` and `__CRAYXE` predefined
macros.  These macros reflect the platform that the compiler wrapper is
running on, i.e. Cray XC and Cray XE machines.  They are not defined on
other platforms such as Apollo80.

Switch to the `__CRAYXT_COMPUTE_LINUX_TARGET` macro. The Cray cc/CC/ftn
wrappers always define this macro on the command line. This macro has
been in use for many years, and is believed to be a reliable way to
detect current and older Cray compiler wrappers.

Fixes: #21904

Modules/CMakeCCompilerId.c.in

@@ -26,7 +26,7 @@ char const* info_simulate = "INFO" ":" "simulate[" SIMULATE_ID "]";
 char const* qnxnto = "INFO" ":" "qnxnto[]";
 #endif
 
-#if defined(__CRAYXE) || defined(__CRAYXC)
+#if defined(__CRAYXT_COMPUTE_LINUX_TARGET)
 char const *info_cray = "INFO" ":" "compiler_wrapper[CrayPrgEnv]";
 #endif
 
@@ -77,7 +77,7 @@ int main(int argc, char* argv[])
 #ifdef SIMULATE_VERSION_MAJOR
   require += info_simulate_version[argc];
 #endif
-#if defined(__CRAYXE) || defined(__CRAYXC)
+#if defined(__CRAYXT_COMPUTE_LINUX_TARGET)
   require += info_cray[argc];
 #endif
   require += info_language_dialect_default[argc];

Modules/CMakeCXXCompilerId.cpp.in

@@ -20,7 +20,7 @@ char const* info_simulate = "INFO" ":" "simulate[" SIMULATE_ID "]";
 char const* qnxnto = "INFO" ":" "qnxnto[]";
 #endif
 
-#if defined(__CRAYXE) || defined(__CRAYXC)
+#if defined(__CRAYXT_COMPUTE_LINUX_TARGET)
 char const *info_cray = "INFO" ":" "compiler_wrapper[CrayPrgEnv]";
 #endif
 
@@ -76,7 +76,7 @@ int main(int argc, char* argv[])
 #ifdef SIMULATE_VERSION_MAJOR
   require += info_simulate_version[argc];
 #endif
-#if defined(__CRAYXE) || defined(__CRAYXC)
+#if defined(__CRAYXT_COMPUTE_LINUX_TARGET)
   require += info_cray[argc];
 #endif
   require += info_language_dialect_default[argc];

Modules/CMakeFortranCompilerId.F.in

@@ -108,7 +108,7 @@
 #else
         PRINT *, 'INFO:compiler[]'
 #endif
-#if defined(__CRAYXE) || defined(__CRAYXC)
+#if defined(__CRAYXT_COMPUTE_LINUX_TARGET)
         PRINT *, 'INFO:compiler_wrapper[CrayPrgEnv]'
 #endif