glcpp: Reject #version after the version has been resolved.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74166
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Carl Worth <cworth@cworth.org>

src/glsl/glcpp/glcpp-parse.y

@@ -375,9 +375,15 @@ control_line:
 		_glcpp_parser_skip_stack_pop (parser, & @1);
 	} NEWLINE
 |	HASH_VERSION integer_constant NEWLINE {
+		if (parser->version_resolved) {
+			glcpp_error(& @1, parser, "#version must appear on the first line");
+		}
 		_glcpp_parser_handle_version_declaration(parser, $2, NULL, true);
 	}
 |	HASH_VERSION integer_constant IDENTIFIER NEWLINE {
+		if (parser->version_resolved) {
+			glcpp_error(& @1, parser, "#version must appear on the first line");
+		}
 		_glcpp_parser_handle_version_declaration(parser, $2, $3, true);
 	}
 |	HASH NEWLINE {