Log message:
Pullup ticket #5355 - requested by sevan
lang/gcc49: build fix

Revisions pulled up:
- lang/gcc49/Makefile                                           1.14

---
   Module Name:    pkgsrc
   Committed By:   maya
   Date:           Sat Apr 22 12:22:01 UTC 2017

   Modified Files:
           pkgsrc/lang/gcc49: Makefile

   Log message:
   gcc49: don't use precompiled headers for libstdc++

   this is a build time optimization that causes hangs on some machines
   (netbsd-7/i386, but not netbsd-7/amd64). disable it globally instead
   of guessing which are broken.

   gcc{5,6} are already disabling it.

   PR pkg/51352: Compilation error on lang/gcc49
   PR pkg/50210: Compilation of gcc 4.9 and 5.2 hangs on NetBSD 6.1_STABLE