[lldb][yaml2macho-core] Disable two API tests on Windows
I changed two tests that were previously @skipUnlessDarwin
to run on all systems, using yaml2macho-core. I'm seeing
failures on these tests on the Windows bots. I'm skipping
them on Windows for now to unblock the CI, while I try to
understand if this is a yaml2macho-core bug, or an existing
problem with lldb's macho corefile reading on windows bug.
v. https://github.com/llvm/llvm-project/pull/153911
