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cpp: Add null preprocesor clause

A preprocessor line containing only a new line is considered a null
preprocessor clause and it must be ignored.

--- a/src/cmd/cc/cc1/cpp.c

+++ b/src/cmd/cc/cc1/cpp.c

@@ -783,11 +783,14 @@

 	next();

 	namespace = NS_IDEN;

+	if (yytoken == '\n')

+		goto ret;

+

 	for (bp = clauses; bp->token && bp->token != yytoken; ++bp)

 		;

 	if (!bp->token) {

 		errorp("incorrect preprocessor directive '%s'", yytext);

-		goto error;

+		goto ret;

 	}

 	DBG("CPP %s", yytext);

@@ -805,7 +808,7 @@

 	if (yytoken != '\n' && !cppoff && bp->token != INCLUDE)

 		errorp("trailing characters after preprocessor directive");

-error:

+ret:

 	disescape = 0;

 	disexpand = 0;

 	lexmode = CCMODE;