tree ad4ca8d1ce5c81d6c7f25ee960226af47949c6f1
parent 3b5568d57bd9b76c1ed7a0da3561381d3f42fbfa
author Andrew Hsieh <andrewhsieh@google.com> 1352524702 -0800
committer Andrew Hsieh <andrewhsieh@google.com> 1352524702 -0800

Add host_toolchain_header path if defined

host_toolchain_header may be defined for build in MacOSX
when SDK 10.8 is selected in build/core/combo/HOST_darwin-x86.mk.
It points to prebuilts/gcc/darwin-x86/host/i686-apple-darwin-4.2.1/
lib/gcc/i686-apple-darwin1?/4.2.1/include for headers such as stdarg.h
no longer provided by MacOSX SDK since 10.8

See https://android-review.googlesource.com/#/c/46202

Change-Id: Id7321ae0d8a56098bb0646d2ff7ddee9601565a9