Merge branch 'master' into ng/master

* master:
  NEWS: one more minor fixlet
  maint: port check-minimal-autoconf to VPATH builds
  tests: avoid spurious failures in Linux -> MinGW cross-compilation mode
  tests: simplify checks for some expected variables values in Makefiles
  NEWS: improve and update wording
  tests: fix/improve few heading comments
  coverage: new test on Texinfo @include support
  tests: tighten a grepping check
  tests: more significant names for some tests
  rename-tests: rework some code for clarity and safety
  tests: cosmetic changes in t/extra-sources.sh
  rename-tests: inform the user about the pre-filled commit msg
  typofix: in comments in 'maintainer/rename-tests'
  rename-tests: also "git add" list-of-tests.mk
  tests: rename t/exsource.sh -> t/extra-sources.sh

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

diff --cc maintainer/maint.mk
Simple merge

diff --cc t/extra-sources.sh
Simple merge

diff --cc t/lflags-cxx.sh
Simple merge

diff --cc t/lflags.sh
Simple merge

diff --cc t/yflags-cxx.sh
Simple merge

diff --cc t/yflags.sh
Simple merge