gh-151422: Don't link libffi into _ctypes_test.so#151423
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Minor build fix. This makes the ctypes tests run on Emscripten.
There is a bug in the Emscripten dynamic loader that caused any dynamic library that links libffi to fail to load. _ctypes_test.so unnecessarily links libffi so it would fail to load and tests that needed it were skipped.
There are two test failures behind that: one involving stack overflows which we have to skip as usual, and one that assumes that the abi for a function that takes a single struct with two doubles is the same as the abi for a function that takes two double arguments. This is not true in webassembly so we skip the test.