Don't apply --exclude-libs for the host.
Don't apply --exclude-libs for the host.

The Mac linker doesn't support this flag, and we don't actually need
it there anyway because we link dynamically to the system's compiler
runtime lib.

Bug: http://b/24166967
Change-Id: I62a926ed39d9fc487638e0c1a172762503dd633e

xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build