Remove progname variable

The error message shouldn't specify the name of the binary, that's
supposed to be known by the caller.

Update test reference outputs.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>

src/fix/main.c

@@ -23,8 +23,6 @@
 
 #include "extern/err.h"
 
-char *progname;
-
 static void
 usage(void)
 {
@@ -71,8 +69,6 @@ main(int argc, char *argv[])
 	int version;   /* mask ROM version number */
 	int padvalue;  /* to pad the rom with if it changes size */
 
-	progname = "rgbfix";
-
 	while ((ch = getopt(argc, argv, "Cci:jk:l:m:n:p:sr:t:v")) != -1) {
 		switch (ch) {
 		case 'C':