Fix module tests on Visual Studio builds
On Visual Studio, Meson builds modules as xxxx.dll, not libxxxx.dll when xxxx is specified as the name for the shared_module() build directive. This means that in the test programs if we expect for libxxxx for the module name, the test will fail as there is no libxxxx.dll but there is xxxx.dll. This makes the test program look for the module files correctly.
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