Don't strip libraries even if the NDK is installed.

This allows reproducible builds regardless of whether the NDK is installed.
2 jobs for 1612-do-not-strip-libs in 9 minutes and 22 seconds (queued for 8 seconds)
Status Job ID Name Coverage
  Test
passed #8037
test

00:09:22

 
  Optional Tests
manual #8038
allowed to fail manual
manual_tests