Use "git rev-parse" for the toybox version.

This is similar to upstream commit 90afbad4c1f115d5363fe99eb797d2458cd298a0,
but without relying on tags (which we don't have) and with an extra
"-android" on the end.

Change-Id: Iec1c50acf2615236213d511ff10845a31c9b9d0f
1 file changed