Revert "libbinder: disallow APEX at build time"

Build breakage.

This reverts commit 8852cc78a0f0c02caf61f21cb3c520583025ea69.

Bug: 161926892
Reason for revert: b/165698873 - broken build

Change-Id: I4708d5e5aaba655b3399bf59ba342f303af7a8ff
4 files changed