net-dialup/ppp: pull upstream fix for parsing options in config file

This CL pulls an upstream fix "commit
7658e8257183f062dc01f87969c140707c7e52cb (pppd: Eliminate potential
integer overflow in option parsing)".

BUG=chromium:390709
TEST=Tested the following:
1. `emerge-$BOARD net-dialup/ppp`
2. Run the following tests:
   - network_VPNConnect.l2tpipsec_psk
   - network_VPNConnect.l2tpipsec_cert
3. Test 3G connectivity with a PPP-based dongle.

Change-Id: I48d373a093306dfb038878f20bd16c5ed68056ed
Reviewed-on: https://chromium-review.googlesource.com/211754
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
2 files changed