Raise minimal GCC version,

Test with 4.8 is OK
With 4.4: error: #pragma GCC diagnostic not allowed inside functions

Author: remicollet

ext/intl/idn/idn.c

@@ -226,7 +226,7 @@ static void php_intl_idn_to(INTERNAL_FUNCTION_PARAMETERS,
 #if defined(__clang__)
 # pragma clang diagnostic push
 # pragma clang diagnostic ignored "-Wdeprecated-declarations"
-#elif ZEND_GCC_VERSION >= 4002
+#elif ZEND_GCC_VERSION >= 4008
 # pragma GCC diagnostic push
 # pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 #endif
@@ -237,7 +237,7 @@ static void php_intl_idn_to(INTERNAL_FUNCTION_PARAMETERS,
 		}
 #if defined(__clang__)
 # pragma clang diagnostic pop
-#elif ZEND_GCC_VERSION >= 4002
+#elif ZEND_GCC_VERSION >= 4008
 # pragma GCC diagnostic pop
 #endif
 		efree(ustring);