find_library: Find shared libraries with numerical suffixes

Commit 342fc040 (Recognize shared library files with a numerical
suffix, 2013-04-11) taught cmComputeLinkInformation to handle
shared libraries with numerical suffixes. Before this commit,
find_library ignored such shared libraries. This is a problem
for finding libGL.so.1 on a raspberryPi. Apparently there
is no libGL.so without a numeric suffix, so the GL library can
not be found.
Merge topic 'find-libs-numeric-suffix' into next

2e38093 find_library: Find shared libraries with numerical suffixes