android: fix 'make install' in LOAndroid3

The error was:

$ make install verbose=t
../../../config_host.mk:655: /git/config__lang.mk: No such file or directory
make: *** No rule to make target '/git/config__lang.mk'.  Stop.

Change-Id: I4f976c27217cb1827ce2a7b39c1bc301e45f149b

android/experimental/LOAndroid3/Makefile

 ifeq ($(BUILDDIR),)
+gb_Side:=host
 include ../../../config_host.mk
 endif