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[cc1] Add more comments about macro expansion and EOF

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -128,7 +128,7 @@

 		--hide->hide;

 		/*

 		 * If the symbol is not declared then it was

-		 * an extension due to a #if directive with

+		 * an expansion due to a #if directive with

 		 * a non declared symbol (expanded to 0),

 		 * thus we have to kill the symbol

 		 */

@@ -648,6 +648,11 @@

 		return;

 	if (lexmode == CPPMODE) {

+		/*

+		 * If we are in cpp mode, we only return eof when

+		 * we don't have more inputs, or when the next

+		 * next input is from a file

+		 */

 		if (!input || !input->next || !input->next->fp)

 			return;

 	}