[vala] Created tag 0.51.2

[Rico Tzschichholz <ricotz src gnome org>]

The signed tag '0.51.2' was created.

Tagger: Rico Tzschichholz <ricotz ubuntu com>
Date: 1613640494 +0100

    0.51.2

Changes since the last tag '0.51.1':

Rico Tzschichholz (12):
      vala: Check type-arguments in base-types/prerequisites of class/interface
      vala: Include type-checks in preconditions of methods for type narrowing
      gstreamer: Update from 1.19.0+ git master
      vapi: Update GIR-based bindings
      codewriter: Output valid vala syntax for LoopStatement
      codewriter: Don't write trailing ";" after body of WithStatement
      vala: Capturing va_list parameters/variables is not allowed
      codegen: Report error for unsupported symbol_reference of MemberInitializer
      vala: Simplify Expression.parent_statement
      vala: Move SemanticAnalyzer.vist_member_initializer() to MemberInitializer
      vala: Properly parse and handle chained initialization of members
      Release 0.51.2