Fix missing pragma warning(pop) and other warnings under MSVC

Fixes #1072

include/internal/catch_compiler_capabilities.h

@@ -82,7 +82,7 @@
 
 // Universal Windows platform does not support SEH
 // Or console colours (or console at all...)
-#  if (WINAPI_FAMILY == WINAPI_FAMILY_APP)
+#  if defined(WINAPI_FAMILY) && (WINAPI_FAMILY == WINAPI_FAMILY_APP)
 #    define CATCH_CONFIG_COLOUR_NONE
 #  else
 #    define CATCH_INTERNAL_CONFIG_WINDOWS_SEH

include/internal/catch_decomposer.h

@@ -162,4 +162,8 @@ namespace Catch {
 
 } // end namespace Catch
 
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
 #endif // TWOBLUECUBES_CATCH_DECOMPOSER_H_INCLUDED