cisco/openh264 — pull request #1063 by mstorsjo (2014-07-02 09:30:02+00:00)
Title: Use += for all submodules INCLUDE variables

This makes it easier for platform specific makefiles to add
things to some of them. (build/platform-android.mk already does this
for a few submodules, e.g. GTEST_INCLUDES and CODEC_UNITTEST_INCLUDES
already use +=.)