cmake: support `make` and `make install`
cmake: support `make` and `make install`

- `make` or `ninja` will not build but not install
- `make install` or `ninja install` will build __and__ install

Only for build system generator Visual Studio, specify the following
to disable installation of lib files:

    ZIG_SKIP_INSTALL_LIB_FILES=ON

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