Remove __progname; add progname set to argv[0] in each main().

Makefile

@@ -87,7 +87,6 @@ src/asm/asmy.h: src/asm/asmy.c
 mingw:
 	$Qenv PATH=/usr/local/mingw32/bin:/bin:/usr/bin:/usr/local/bin \
 		make WARNFLAGS= CC=gcc CFLAGS="-I/usr/local/mingw32/include \
-			-D__progname=\\\"\\\" \
 			${CFLAGS}"
 	$Qmv rgbasm rgbasm.exe
 	$Qmv rgblink rgblink.exe

src/asm/main.c

@@ -19,6 +19,9 @@ void setuplex(void);
 int cldefines_index;
 int cldefines_size;
 char **cldefines;
+
+char *progname;
+
 clock_t nStartClock, nEndClock;
 SLONG nLineNo;
 ULONG nTotalLines, nPass, nPC, nIFDepth, nErrors;
@@ -280,6 +283,8 @@ main(int argc, char *argv[])
 	if (argc == 1)
 		usage();
 
+	progname = argv[0];
+
 	/* yydebug=1; */
 
 	DefaultOptions.gbgfx[0] = '0';

src/extern/err.c

@@ -26,13 +26,11 @@
 #include <stdlib.h>
 #include "extern/err.h"
 
-#ifndef __MINGW32__
-char *__progname;
-#endif
+extern char *progname;
 
 void rgbds_vwarn(const char *fmt, va_list ap)
 {
-	fprintf (stderr, "%s: ", __progname);
+	fprintf (stderr, "%s: ", progname);
 	if (fmt) {
 		vfprintf(stderr, fmt, ap);
 		fputs (": ", stderr);
@@ -42,7 +40,7 @@ void rgbds_vwarn(const char *fmt, va_list ap)
 
 void rgbds_vwarnx(const char *fmt, va_list ap)
 {
-	fprintf (stderr, "%s: ", __progname);
+	fprintf (stderr, "%s: ", progname);
 	if (fmt) vfprintf(stderr, fmt, ap);
 	putc('\n', stderr);
 }

src/fix/main.c

@@ -23,6 +23,8 @@
 
 #include "extern/err.h"
 
+char *progname;
+
 static void
 usage(void)
 {
@@ -69,6 +71,8 @@ main(int argc, char *argv[])
 	int version;   /* mask ROM version number */
 	int padvalue;  /* to pad the rom with if it changes size */
 
+	progname = argv[0];
+
 	while ((ch = getopt(argc, argv, "Cci:jk:l:m:n:p:sr:t:v")) != -1) {
 		switch (ch) {
 		case 'C':

src/link/main.c

@@ -24,6 +24,8 @@ SLONG options = 0;
 SLONG fillchar = 0;
 char smartlinkstartsymbol[256];
 
+char *progname;
+
 /*
  * Print the usagescreen
  *
@@ -52,6 +54,8 @@ main(int argc, char *argv[])
 	if (argc == 1)
 		usage();
 
+	progname = argv[0];
+
 	while ((ch = getopt(argc, argv, "m:n:o:p:s:t")) != -1) {
 		switch (ch) {
 		case 'm':