Revert "Conditional check for gdesktopappinfo header"
This reverts commit 13b94dab.
As pointed out in #6557, this commit is broken and causes gio/gdesktopappinfo.h to never be found.
This reverts commit 13b94dab.
As pointed out in #6557, this commit is broken and causes gio/gdesktopappinfo.h to never be found.