Don't set "-fstack-clash-protection" option on Windows

Signed-off-by: Carlo Bramini <carlo_bramini@users.sourceforge.net>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

CompilerChecks.cmake

@@ -85,9 +85,11 @@ if (UNIX)
         endif()
     endif (WITH_STACK_PROTECTOR_STRONG)
 
-    check_c_compiler_flag_ssp("-fstack-clash-protection" WITH_STACK_CLASH_PROTECTION)
-    if (WITH_STACK_CLASH_PROTECTION)
-        list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-clash-protection")
+    if (NOT WINDOWS AND NOT CYGWIN)
+        check_c_compiler_flag_ssp("-fstack-clash-protection" WITH_STACK_CLASH_PROTECTION)
+        if (WITH_STACK_CLASH_PROTECTION)
+            list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-clash-protection")
+        endif()
     endif()
 
     if (PICKY_DEVELOPER)