vala 0.40.1 release.

Various bug fixes:

• codegen: Don't add target fields for captured delegates without target
• codegen: Don't add length fields for captured fixed-length array variables
• valadoc: Bump VALA_0_xx defines and glib_minor to match 0.40 series

Bindings:

• Add libgeoclue-2.0 bindings [#794376]
• gobject-2.0: Cherry-pick some changes from 0.42
• gdk-3.0,gtk+-3.0: Update to 3.22.29
• gtk+-4.0: Update to 3.93.0+433517fd
• gtk+-.0: Fix iter parameter of TextView.backward/forward*/move_visually() [#794345]
• gstreamer-1.0: Update to 1.13.91 and add gstreamer-webrtc-1.0 bindings
• libgsf-1: Switch to GIR and update to 1.14.42
• linux: Add various symbols
• posix: Add various symbols
• posix: Include sys/sysmacros.h for major(), minor() and makedev() [#794651]
• webkit-1.0: Update to 2.4.11
• webkit2gtk-4.0: Update to 2.20.0
• Update GIR-based bindings