Remove superfluous include path from Makefile

This include path was added to protect agaisnt picking up the wrong memory.h,
but this is not needed as we no longer include any files of that name. See
https://android-git.corp.google.com/g/#/c/40117.

Change-Id: Ib9396dcd16aef287f0a1a1bde76d848c7beb4d37
1 file changed