glcpp: Reject garbage after #else and #endif tokens

Previously we were accepting garbage after #else and #endif tokens when
the previous preprocessor conditional evaluated to false (eg, #if 0).

When the preprocessor hits a false conditional, it switches the lexer
into the SKIP state, in which it ignores non-control tokens. The parser
pops the SKIP state off the stack when it reaches the associated #elif,
#else, or #endif. Unfortunately, that meant that it only left the SKIP
state after the lexing the entire line containing the #token and thus
would accept garbage after the #token.

To fix this we use a mid-rule, which is executed immediately after the
#token is parsed.

NOTE: This is a candidate for the stable branch
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=56442
Fixes: preprocess17_frag.test from oglconform
Reviewed-by: Carl Worth <cworth@cworth.org> (glcpp-parse.y)
Acked-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/glcpp/glcpp-parse.y

@@ -327,12 +327,12 @@ control_line:
 			glcpp_warning(& @1, parser, "ignoring illegal #elif without expression");
 		}
 	}
-|	HASH_ELSE NEWLINE {
+|	HASH_ELSE {
 		_glcpp_parser_skip_stack_change_if (parser, & @1, "else", 1);
-	}
-|	HASH_ENDIF NEWLINE {
+	} NEWLINE
+|	HASH_ENDIF {
 		_glcpp_parser_skip_stack_pop (parser, & @1);
-	}
+	} NEWLINE
 |	HASH_VERSION integer_constant NEWLINE {
 		macro_t *macro = hash_table_find (parser->defines, "__VERSION__");
 		if (macro) {

src/glsl/glcpp/tests/102-garbage-after-endif.c

@@ -0,0 +1,2 @@
+#if 0
+#endif garbage

src/glsl/glcpp/tests/102-garbage-after-endif.c.expected

@@ -0,0 +1,2 @@
+0:2(8): preprocessor error: syntax error, unexpected IDENTIFIER, expecting NEWLINE
+

src/glsl/glcpp/tests/103-garbage-after-else.c

@@ -0,0 +1,3 @@
+#if 0
+#else garbage
+#endif

src/glsl/glcpp/tests/103-garbage-after-else.c.expected

@@ -0,0 +1,4 @@
+0:2(7): preprocessor error: syntax error, unexpected IDENTIFIER, expecting NEWLINE
+0:1(7): preprocessor error: Unterminated #if
+
+