pjproject_bundled: Find shared libraries in root --with-ssl=PATH.

The script configure from Teluu expects shared libraries (.so) in a subfolder
called 'lib', when --with-xyz=PATH is specified. However for OpenSSL, the
default location is the root of the source folder = PATH. Furthermore, Asterisk
supports both, 'lib' and root. For consistency and because Asterisk is using
(only) OpenSSL in PJProject, it is enhanced to support both locations, just
like Asterisk.

ASTERISK-27995

Change-Id: I8eb916a88b6b8c22e29bb40bee8faaca6c73406f