Ensure default behavior for SIGPIPE

* src/tar.c (main): Install default handler for SIGPIPE.
Proposed by Bastian Blank.

src/tar.c

@@ -2454,10 +2454,10 @@ main (int argc, char **argv)
 
   obstack_init (&argv_stk);
 
-#ifdef SIGCHLD
+  /* Ensure default behavior for some signals */
+  signal (SIGPIPE, SIG_DFL);
   /* System V fork+wait does not work if SIGCHLD is ignored.  */
   signal (SIGCHLD, SIG_DFL);
-#endif
 
   /* Decode options.  */