[UMKM_APITEST] Add a test for syscall handling

This is intentionally not part of ntdll_apitest, because that links to advapi32, which links to rpcrt4, which (wrongly!) links to ws2_32, which (wrongl

[UMKM_APITEST] Add a test for syscall handling

This is intentionally not part of ntdll_apitest, because that links to advapi32, which links to rpcrt4, which (wrongly!) links to ws2_32, which (wrongly!) links to user32, which breaks the test.

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