Disable R__DEPRECATED on gcc 5

It does not support deprecation of enumerators (reproducer at
https://godbolt.org/z/1TEo5M), which breaks compilation e.g. on
Ubuntu 16.

Author: eguiraud

core/foundation/inc/ROOT/RConfig.hxx

@@ -462,9 +462,10 @@
 
 /*---- deprecation -----------------------------------------------------------*/
 #if defined(__GNUC__) || defined(__clang__) || defined(__INTEL_COMPILER)
-# if (__GNUC__ == 5 && (__GNUC_MINOR__ == 1 || __GNUC_MINOR__ == 2)) || defined(R__NO_DEPRECATION)
-/* GCC 5.1, 5.2: false positives due to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15269 
-   or deprecation turned off */
+# if (__GNUC__ == 5) || defined(R__NO_DEPRECATION)
+/* GCC 5.1, 5.2: false positives due to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15269,
+   GCC 5.3, 5.4, 5.5: broken compilation when deprecating enumerators: https://godbolt.org/z/1TEo5M,
+   deprecation turned off */
 #   define _R__DEPRECATED_LATER(REASON)
 # else
 #   define _R__DEPRECATED_LATER(REASON) __attribute__((deprecated(REASON)))