[vala] Created tag 0.51.3

[Rico Tzschichholz <ricotz src gnome org>]

The signed tag '0.51.3' was created.

Tagger: Rico Tzschichholz <ricotz ubuntu com>
Date: 1614441996 +0100

    0.51.3

Changes since the last tag '0.51.2':

Rico Tzschichholz (21):
      codegen: Don't use volatile modifier in glib API when targetting >= 2.68
      vala: Generics value holding struct pointer requires casting on access
      codegen: CCodeBaseModule.get_type_id_expression () won't return null
      girwriter: Output default handler of signals
      tests/girwriter: Increase coverage
      vala: Infer needle type for "in" expression on enum
      vala: Don't allow "in" operation with different enum types
      tests: Add more "girparser" tests to increase coverage
      vapi: Update GIR-based bindings
      codegen: Don't wrongly emit declaration for default-handler of signals
      vala: Improve context check whether property is writeable on assignments
      codegen: Include "string.h" for strcmp() (POSIX)
      vala: Include "stdlib.h" for Enum.to_string() (POSIX)
      tests: Add more "unsupported creation method" tests to increase coverage
      vala: Set proper source_reference for implicit "this" and "result" variables
      vala: Report error for invalid inner operand of unary expressions
      tests: Add some "unary expressions" tests to increase coverage
      webkit2gtk-4.0: Update to 2.31.90
      glib-2.0: Add new symbols from 2.68
      vapi: Update GIR-based bindings
      Release 0.51.3