Use UNIX path on all OSs other than Windows and Plan9 (#3)
Use UNIX path on all OSs other than Windows and Plan9 (#3)

Use UNIX path on all OS's except Windows and Plan9.

Previous settings will cause this library fail to build in other
OS's including BSD distributions (FreeBSD, OpenBSD, NetBSD, etc).

Since /etc/hosts is a pretty standard path for finding hosts file,
it should be OK to set /etc/hosts as default.

Signed-off-by: Kay Lin <042dc4512fa3d391c5170cf3aa61e6a638f84342@v2bv.net>

Co-authored-by: J. Elliot Taylor <878e059c4cb77f8d9e6cd2130a1d06f581399d37@gmail.com>
jaytaylor/go-hostsfile