fix strerror on mips: one error code is out of the 8-bit table range

if we ever encounter other targets where error codes don't fit in the
8-bit range, the table should probably just be bumped to 16-bit, but
for now I don't want to increase the table size on all archs just
because of a bug in the mips abi.

src/errno/strerror.c

 #include <errno.h>
 #include <string.h>
 
-#define E(a,b) a,
+#define E(a,b) ((unsigned char)a),
 static const unsigned char errid[] = {
 #include "__strerror.h"
 };
@@ -16,6 +16,12 @@ char *strerror(int e)
 {
 	const char *s;
 	int i;
+	/* mips has one error code outside of the 8-bit range due to a
+	 * historical typo, so we just remap it. */
+	if (EDQUOT==1133) {
+		if (e==109) e=-1;
+		else if (e==EDQUOT) e=109;
+	}
 	for (i=0; errid[i] && errid[i] != e; i++);
 	for (s=errmsg; i; s++, i--) for (; *s; s++);
 	return (char *)s;