Add WX_FIND_LIB() function to simplify testing for libraries in configure.
No real changes in behaviour but the new WX_FIND_LIB() function can now be used to test for any library. Closes #13375. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69556 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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