QNX: adapt SSL lib file name lookup heuristics

I.e. do not try to load file names that are not there anyhow. The
code would search for libcrypto.so.1.0.0 and libssl.so.1.0.0, while
on QNX the libs are called libcrypto.so and libssl.so, and there
are no symlinks with version numbers.

This saves ~ 45 ms in real apps (tested with Facebook, Twitter and
Foursquare), and ~ 24 ms at app startup in an isolated app without
GUI (difference maybe because threads are fighting for CPU or so).

Task-number: QTBUG-32548
Change-Id: I25869538bbfa3c2848541415e8361e0bd7a8fd50
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>