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Have RGBDS' `err` and `warn` output an error message
The stdlib functions specify the difference between `err` and `errx`
is that the former prints a message obtained with `strerror`.
However, RGBDS' implementation breaks that contract, and `warn`'s puts the
added semicolon in the wrong place.

--- a/src/extern/err.c

+++ b/src/extern/err.c

@@ -14,13 +14,12 @@

 void rgbds_vwarn(const char *fmt, va_list ap)

 {

-	fprintf(stderr, "warning");

+	fprintf(stderr, "warning: ");

 	if (fmt) {

-		fputs(": ", stderr);

 		vfprintf(stderr, fmt, ap);

+		fputs(": ", stderr);

 	}

-	putc('\n', stderr);

-	perror(0);

+	perror(NULL);

 }

 void rgbds_vwarnx(const char *fmt, va_list ap)

@@ -35,12 +34,12 @@

 noreturn_ void rgbds_verr(int status, const char *fmt, va_list ap)

 {

-	fprintf(stderr, "error");

+	fprintf(stderr, "error: ");

 	if (fmt) {

-		fputs(": ", stderr);

 		vfprintf(stderr, fmt, ap);

+		fputs(": ", stderr);

 	}

-	putc('\n', stderr);

+	perror(NULL);

 	exit(status);

 }

-- 

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