1cec500c69
ssize_t is a GNU extension and is not available on Windows or MacOS.
Instead, we use intptr_t which should be effectively equivalent and is
part of the C standard. This should fix the Windows and Mac OS builds.
Fixes: 3af1c82989
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103253
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
Tested-by: Vinson Lee <vlee@freedesktop.org>