[Automake-NG] [FYI] Merge branch 'master' into ng/master

[Stefano Lattarini]

Merge branch 'master' into ng/master

    * master:
      tests: don't always look for a C++ compiler named 'RCC'
      tests: fix bug in pkg-config-macros.sh, could cause spurious SKIPs
      docs: autom4te cache can break CONFIGURE_DEPENDENCIES
      coverage: test CONFIGURE_DEPENDENCIES
      coverage: test CONFIG_STATUS_DEPENDENCIES