Emit no #line directives if gen_line_dirs is false, resolves igh#55.

There are two instances in the code which will print a #line directive
to the resulting lexer, regardless of the value of gen_line_dirs. Fix
them, so they also respect gen_line_dirs.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

src/buf.c

@@ -95,6 +95,9 @@ struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno)
     const char *src;
     size_t tsz;
 
+    if (gen_line_dirs)
+	return buf;
+
     tsz = strlen("#line \"\"\n")                +   /* constant parts */
                2 * strlen (filename)            +   /* filename with possibly all backslashes escaped */
                (int) (1 + log10 (abs (lineno))) +   /* line number */

src/main.c

@@ -496,7 +496,8 @@ void check_options (void)
     m4defs_buf.nelts = 0; /* memory leak here. */
 
     /* Place a bogus line directive, it will be fixed in the filter. */
-    outn("#line 0 \"M4_YY_OUTFILE_NAME\"\n");
+    if (gen_line_dirs)
+        outn("#line 0 \"M4_YY_OUTFILE_NAME\"\n");
 
 	/* Dump the user defined preproc directives. */
 	if (userdef_buf.elts)