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
diff --git a/Android.libv8.mk b/Android.libv8.mk
index 7695807..14c4e19 100644
--- a/Android.libv8.mk
+++ b/Android.libv8.mk
@@ -90,6 +90,6 @@
 	LOCAL_CFLAGS += -DDEBUG -UNDEBUG
 endif
 
-LOCAL_C_INCLUDES += bionic/libc/include $(LOCAL_PATH)/src
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/src
 
 include $(BUILD_STATIC_LIBRARY)