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Basic support for -E flag

This flag makes compilation stop after preprocessor. This version
is only a draft of how it must work.

--- a/cc1/main.c

+++ b/cc1/main.c

@@ -13,6 +13,7 @@

 jmp_buf recover;

 static char *output;

+static int onlycpp;

 static void

 clean(void)

@@ -46,6 +47,9 @@

 			case 'w':

 				warnings = 1;

 				break;

+			case 'E':

+				onlycpp = 1;

+				break;

 			case 'o':

 				if (!*++argv || argv[0][0] == '-')

 					usage();

@@ -67,8 +71,13 @@

 	ikeywords();

 	ilex(*argv);

-	for (next(); yytoken != EOFTOK; decl())

-		/* nothing */;

+	if (onlycpp) {

+		for (next(); yytoken != EOFTOK; next())

+			printf("%s ", yytext);

+	} else {

+		for (next(); yytoken != EOFTOK; decl())

+			/* nothing */;

+	}

 	return 0;

 }