Merge branch 'maint'

Merge branch 'maint'

* maint:
  tests: avoid spurious failures in get-sysconf.test
  scripts: bump the depcomp scriptversion
  sync: some auxiliary files synced from upstream
  coverage: an empty foo_PRIMARY should create directory $(foodir)
  coverage: make sure am__py_compile is defined when needed
  coverage: expose automake bug#10997
  coverage: expose automake bug#10975
  getopt: relax version requirement for perl

+ Extra non-trivial edits:

* tests/dist-pr109765.test: Use 'configure.ac', not 'configure.in'.
* tests/instdir-cond.test: Likewise.
* tests/instdir-empty.test: Likewise.

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