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Fix definition of macros with -D

A correct macro definition must have the number of
the arguments for this macro, so if we don't add
-1# to the user macro definitions then we can
generate some errors later.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -28,11 +28,17 @@

 Symbol *

 defmacro(char *s)

 {

-	char *p;

+	char *p, *q;

 	Symbol *sym;

+	size_t len;

-	if ((p = strchr(s, '=')) != NULL)

+	if ((p = strchr(s, '=')) != NULL) {

 		*p++='\0';

+		len = strlen(p);

+		q = xmalloc(len+4);

+		sprintf(q, "-1#%s", p);

+		p = q;

+	}

 	sym = install(NS_CPP, lookup(NS_CPP, s));

 	sym->u.s = p;

 	return sym;