Consider enabling PortBlocker tests on Wasi

[antonfirsov]

#106977 introduced support for Wasi sockets, but opted-out from test cases using PortBlocker.

@pavelsavara could this be fixed by replacing libc with the right name to import wasi-libc here?

runtime/src/libraries/Common/tests/System/Net/Sockets/SocketTestExtensions.cs

Lines 205 to 209 in 572533b

	[Runtime.InteropServices.DllImport("libc", SetLastError = true)]
	static extern int bind(SafeSocketHandle socket, IntPtr socketAddress, uint addrLen);
	[Runtime.InteropServices.DllImport("libc", SetLastError = true)]
	static extern int getsockname(SafeSocketHandle socket, IntPtr socketAddress, IntPtr addrLenPtr);

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