ld: be less picky about bad line number info

Fixes #1175.

R=lvd
CC=golang-dev
https://golang.org/cl/2439041

src/cmd/ld/dwarf.c

@@ -763,7 +763,7 @@ writelines(void)
 				continue;
 			}
 			if (lh->file < 1) {  // 0 is the past-EOF entry.
-				diag("instruction with linenumber past EOF in %s: %P", unitname, q);
+				//diag("instruction with linenumber past EOF in %s: %P", unitname, q);
 				continue;
 			}