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Allow empty preprocessor directives

C standard allows it, I don't knwo why.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -273,9 +273,12 @@

 		return p;

 	for (++p; isspace(*p); ++p)

 		/* nothing */;

+	if (*p == '\0')

+		return NULL;

 	for (q = p; isalpha(*q); ++q)

 		/* nothing */;

-	n = q - p;

+	if ((n = q - p) == 0)

+		goto incorrect;

 	while (isspace(*q))

 		++q;

 	for (bp = cmds; bp->name; ++bp) {

@@ -288,5 +291,6 @@

 			error("trailing characters after preprocessor directive");

 		return NULL;

 	}

+incorrect:

 	error("incorrect preprocessor directive");

 }