Asterisk makefiles auto-detect SSL library availability,
then they assume that pjproject makefiles will also autodetect
an SSL library at the same time, so they do not pass on the
autodetection result to pjproject.

This normally works, except the pjproject makefiles disables
autodetection when cross-compiling.

Fix by explicitly configuring pjproject to use SSL if we
have been told to use it or it was autodetected

ASTERISK-30424 #close

Change-Id: I8fe2999ea46710e21d1d55a1bed92769c6ebded9