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Emit #lines when it is needed in the cpp output

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -758,5 +758,6 @@

 			}

 		}

 	}

+	putchar('\n');

 }

--- a/cc1/lex.c

+++ b/cc1/lex.c

@@ -215,6 +215,10 @@

 bool

 moreinput(void)

 {

+	static char file[FILENAME_MAX];

+	static unsigned nline;

+	char *s;

+

 repeat:

 	if (!readline())

 		return 0;

@@ -226,8 +230,19 @@

 		goto repeat;

 	}

-	if (onlycpp)

+	if (onlycpp) {

 		putchar('\n');

+		if (strcmp(file, input->fname)) {

+			strcpy(file, input->fname);

+			s = "#line %u %s\n";

+		} else if (nline+1 != input->nline) {

+			s = "#line %u\n";

+		} else {

+			s = "";

+		}

+		nline = input->nline;

+		printf(s, nline, file);

+	}

 	input->begin = input->p;

 	return 1;

 }