Only permit comments at beginning of line in file manifests (RhBug:112727)

We only permit comments at beginning of line in specs and macro
files too, of all things file manifests don't need anything fancier.
Resolves the oldest rpm bug in RH bugzilla, only took 16 years...

lib/manifest.c

@@ -84,7 +84,8 @@ rpmRC rpmReadPackageManifest(FD_t fd, int * argcPtr, char *** argvPtr)
 	}
 
 	/* Skip comments. */
-	if ((se = strchr(s, '#')) != NULL) *se = '\0';
+	if (*s == '#')
+	    continue;
 
 	/* Trim white space. */
 	se = s + strlen(s);