Fix generate_build_files.py to account for crypto/test.

crypto/test contains not tests, but a test support library that should be
linked into each test.

Change-Id: If1c85eda2a3df1717edd38575e1ec792323c400b
Reviewed-on: https://boringssl-review.googlesource.com/4720
Reviewed-by: Adam Langley <agl@google.com>
1 file changed