Prevents crashing the CppunitTest_smoketest on Ubuntu Trusty.

Probably this should be a subclass in osl:: with a proper virtual
destructor. The release() function is actually called for a lot
of osl::Module handling all over the code.

The alternative would have been a custom allocator for the map.

Change-Id: I10b86587556056b7080d0d04a27f07dbb8ca4d48
Reviewed-on: https://gerrit.libreoffice.org/57067Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Jenkins