libc_installation.zig: don't special-case based on C ABI
libc_installation.zig: don't special-case based on C ABI

Whether the C ABI is mingw-w64 or msvc, detection of native libc paths
should be the same. In the future we may want to allow passing a C ABI
parameter to detectNativeCPaths() but for now we have the same behavior
regardless.

andrewrk/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,zig-lang/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig