[qfcc] Ensure non-unicode char string is terminated

Once a unicode char (ie, > 127) was used, any ascii chars would get the
tail of the last unicode char resulting in broken utf-8 streams. The
resulting null glyph boxes were not very appealing.

tools/qfcc/source/strpool.c

@@ -411,6 +411,7 @@ make_string (char *token, char **end)
 			unicount = 0;
 		} else {
 			s[0] = c;
+			s[1] = 0;
 		}
 		dstring_appendstr (str, s);
 	} while (1);