Merge branch 'maint'

* maint:
  tests: typofix in the shebang line of 't/py-compile-destdir.sh'
  HACKING: release process: fixlets about the announcement
  maint: post-release minor version bump
  release: stable release 1.12.5
  tests: avoid errors due to underquoted third-party macros
  maintcheck: also consider contrib tests for syntax checks
  cosmetics: whitespace fixlets in syntax-checks.mk
  maint: prefer $(MKDIR_P) over $(mkinstalldirs) in maintainer rules

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

diff --cc syntax-checks.mk
Simple merge

diff --cc t/pkg-config-macros.sh
Simple merge

diff --cc t/py-compile-destdir.sh
Simple merge