The -c option for wget and -C - option to curl are used to make it
continue the download if the file already exists. The idea was that it
wouldn't waste time downloading the files again if the file already
exists. However this causes problems if the remote file gets larger
because the download will continue from the size of the old file so it
will get corrupt. Instead let's just explicitly check if the file
already exists and avoid calling wget or curl altogether.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
mesa_wgl.h can no longer be fetched from upstream and since it's no
longer used anyway we don't fetch this any more. This also updates
the blurb printed after fetching dependencies to show how to run
./configure so we pass --enable-wgl not --enable-stub-winsys and
to also pass the -I path for the cogl-cross/include directory which has
the latest gl.h we fetched so the build doesn't try and use the headers
shipped with the mingw toolchain which may be out-of-date.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
