Fix(build): Remove broken directives for windows compilation

[magicaldave]

No description provided.

[ruabmbua]

I am curious, do you have any problems building on windows from master?
When I try this patch it starts failing for me, since cmake automatically seems to put the artifacts into Debug or Release subfolders.

[magicaldave]

Ah, yes, I haven't had the chance to correctly update this yet! When cross compiling on a non-windows host, for a Windows target, this patch fixes those builds, as enet itself doesn't end up in Debug/Release folders. However I did notice later during a CI build that an actual windows host does still need the original rule. So it actually needs to be modified to determine whether it's also a windows host, not target, doing the compile.

[ruabmbua]

b.t.w. see this issue that someone else had almost at the same time: #21

I will work out a proper fix, probably by patching the C libraries cmake build system to add a proper install target.

[ruabmbua]

Closed in favor of closed in favor of #22

[ruabmbua]

@magicaldave can you try to build with the version from #22? I struggle to get anything to build on mingw (I am not a windows user).