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Make `-Werror=` with a meta warning an error
The previous behavior was to just enable the meta warning's warnings.
This is an error now because it doesn't make sense to do that, does it?

--- a/src/asm/warning.c

+++ b/src/asm/warning.c

@@ -118,6 +118,9 @@

 		/* TODO: improve the matching performance? */

 		if (!strcmp(flag, warningFlags[id])) {

 			/* We got a match! */

+			if (setError)

+				errx(1, "Cannot make meta warning \"%s\" into an error", flag);

+

 			uint8_t const *ptr =

 					metaWarningCommands[id - NB_WARNINGS];