[vala] (13 commits) ...vapi: Update GIR-based bindings

[Rico Tzschichholz <ricotz src gnome org>]

Summary of changes:

  5aa1911... Bump version suffix to 0.54 (*)
  4a08b52... vala: Add Profile.LIBC as synonym for POSIX and accept "lib (*)
  3877c50... vala: Improve semantic check of simple type structs (*)
  a7012f0... vala: Refactor UnresolvedSymbol/Type constructors (*)
  cbc11c2... parser: Minor semantic checks to improve error messages (*)
  20fcf9c... parser: Allow empty member-initializer and accept trailing  (*)
  909423c... vapi: Remove webkit-1.0 bindings (*)
  60461f3... vapi: Remove gedit-2.20 bindings (*)
  46986e4... codegen: Use ArrayType.length_type in type specific wrapper (*)
  636d63a... codegen: Use ssize_t for length variables in common array h (*)
  9023a8d... parser: Include INTERR token in source_reference of parsed  (*)
  11e6f71... vala: length-type of arrays must not be nullable (*)
  eb7dc13... vapi: Update GIR-based bindings (*)

(*) This commit already existed in another branch; no separate mail sent