[SCons] Fix for the cyglink tool

Hi, The cyglink tool in Cygwin's distrib of SCons has a typo that prevents it from generating .a import files when building shared libraries with the SharedLibrary method. In cyglink.py, shlib_emitter creates a target file named with IMPLIBPREFIX and IMPLIBSUFFIX but shlib_generator checks

Re: [SCons] Fix for the cyglink tool

Zouzou wrote: The cyglink tool in Cygwin's distrib of SCons has a typo that prevents it from generating .a import files when building shared libraries with the SharedLibrary method. In cyglink.py, shlib_emitter creates a target file named with IMPLIBPREFIX and IMPLIBSUFFIX but