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cc1: Add proper handling of strings too long

When a string is too long we can just ignore everything until
we find end of string or quotes.

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

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

@@ -554,8 +554,15 @@

 		if (c == '\\')

 			c = escape();

 		if (bp == &yytext[STRINGSIZ+1]) {

-			/* TODO: proper error handling here */

-			error("string too long");

+			for (++input->p; *input->p != '"'; ++input->p) {

+				if (*input->p == '\\')

+					++input->p;

+				if (*input->p == '\0')

+					break;

+			}

+			--bp;

+			errorp("string too long");

+			break;

 		}

 		*bp++ = c;

 	}