glsl/glcpp: Drop extra, final newline from most output

The glcpp parser is line-based, so it needs to see a NEWLINE token at the end
of each line. This causes a trick for files that end without a final newline.

Previously, the lexer for glcpp punted in this case by unconditionally
returning a NEWLINE token at end-of-file, (causing most files to have an extra
blank line at the end). Here, we refine this by lexing end-of-file as a
NEWLINE token only if the immediately preceding token was not a NEWLINE token.

The patch is a minor change that only looks huge for two reasons:

	1. Almost all glcpp test result ".expected" files are updated to drop
	   the extra newline.

	2. All return statements from the lexer are adjusted to use a new
	   RETURN_TOKEN macro that tracks the last-token-was-a-newline state.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

src/glsl/glcpp/glcpp.h

@@ -177,6 +177,7 @@ struct glcpp_parser {
 	active_list_t *active;
 	int lexing_directive;
 	int space_tokens;
+	int last_token_was_newline;
 	int newline_as_space;
 	int in_control_line;
 	int paren_count;