Revert "webkitgtk, pinentry: require gobject-introspection-data in DISTRO_FEATURES...

Revert "webkitgtk, pinentry: require gobject-introspection-data in DISTRO_FEATURES when libsecret PACKAGECONFIG is enabled"

This reverts commit 91264e5e0ab40b796e214edd84c72bc88b363778.

It adds meson options 'instrospection' to disable gobject introspection
files build. So no need to check distro feature 'gobject-introspection-data'
any longer.

Keep the spaces adjustment and comment removal.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>