Revert committish 5e8f6d: Add a #define to support building dbus-c++ on older Linux distros

BUG=chromium:151685
TEST=emerge dbus-c++.

Change-Id: Ib81877b9634baea7a58f375f588c055184097383
Reviewed-on: https://chromium-review.googlesource.com/180323
Reviewed-by: mukesh agrawal <quiche@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Tested-by: Lei Zhang <thestig@chromium.org>
1 file changed