base.bbclass(oe_libinstall): Handle shared libs basenames of which were

base.bbclass(oe_libinstall): Handle shared libs basenames of which were
suffixed with version properly.
* Sometimes soname of a shlib is overriden to contain extra version. If
it's build by libtool, .la still has basename w/o suffix. This fix recognizes
such case, and handles shlib installation properly (via libtool).
* Example of this is smpeg_0.4.4+0.4.5cvs20040311 which builds libsmpeg-0.4,
while still being linked as -lsmpeg.
Fixes #1389.