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Add DBG() macro

This macro removes all the debug output when NDEBUG is defined

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -207,12 +207,12 @@

 	if (!parsepars(arguments, arglist, atoi(s)))

 		return 0;

 	for (n = 0; n < atoi(s); ++n)

-		fprintf(stderr, "MACRO par%d:%s\n", n, arglist[n]);

+		DBG(stderr, "MACRO par%d:%s\n", n, arglist[n]);

 	elen = copymacro(buffer, s+3, INPUTSIZ-1, arglist);

 substitute:

-	fprintf(stderr, "MACRO '%s' expanded to :'%s'\n", macroname, buffer);

+	DBG(stderr, "MACRO '%s' expanded to :'%s'\n", macroname, buffer);

 	rlen = strlen(input->p);      /* rigth length */

 	llen = begin - input->line;   /* left length */

 	ilen = input->p - begin;      /* invocation length */

@@ -334,7 +334,7 @@

 	if (!getdefs(args, n, buff+3, LINESIZ-3))

 		goto delete;

 	sym->u.s = xstrdup(buff);

-	fprintf(stderr, "MACRO '%s' defined as '%s'\n", sym->name, buff);

+	DBG(stderr, "MACRO '%s' defined as '%s'\n", sym->name, buff);

 	return;

 delete:

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -537,7 +537,7 @@

 		yytoken = operator();

 exit:

-	fprintf(stderr, "TOKEN %s\n", yytext);

+	DBG(stderr, "TOKEN %s\n", yytext);

 	lex_ns = NS_IDEN;

 	return yytoken;

 }

--- a/inc/cc.h

+++ b/inc/cc.h

@@ -7,6 +7,12 @@

 #endif

 #endif

+#ifndef NDEBUG

+#define DBG(...) fprintf(__VA_ARGS__)

+#else

+#define DBG(...)

+#endif

+

 #define TINT    long

 #define TUINT   unsigned long

 #define TFLOAT  double