Fix a build error reguarding build_sepolicy

build_sepolicy internally uses other tools like checkpolicy and
version_policy. The dependencies are used to be found under
out/host/linux-x86/bin. But that assumption doesn't hold when soong
tried to sandbox command invocations. This change fixes the problem by
setting --android_host_path to the directory where build_sepolicy is
sandboxed and also by adding the internal dependeicies to the `tools`
property so that they are copied to the sandbox directory.

Bug: N/A
Test: choosecombo into aosp_x86_64 and run
m out/soong/.intermediates/system/sepolicy/microdroid_vendor_sepolicy.cil_gen/gen/vendor_sepolicy.cil

Change-Id: I28ae1f9013439f3ca1196b3816e0388ced5246e1
1 file changed