Reland "Export prebuilt tools to Make"

Test: check out/soong/make_vars-aosp_arm.mk
Test: rm -rf out; m product_mac_permissions.xml
Test: use codesearch to look for other problems with BISON/LEX/M4
Change-Id: I16ab5c2f62107be59dbfb046a76f2418c2db9b0e
1 file changed