[network-manager-openvpn] (14 commits) ...build: merge branch 'th/build-non-recursive-make'

[Thomas Haller <thaller src gnome org>]

Summary of changes:

  d4b8ff8... shared: update shared files
  b704fe8... build: update m4 macros and add --enable-lto and --enable-l
  e22e0d1... build: style cleanup of top-level Makefile.am
  6c8445b... build: merge shared/Makefile.am in top-level Makefile.am
  1001747... build: merge src/Makefile.am in top-level Makefile.am
  feb28cc... build: merge properties/Makefile.am in top-level Makefile.a
  42ebbfa... build: merge auth-dialog/Makefile.am in top-level Makefile.
  e57d774... build: enable silent make rules
  6abd50d... build: refactor building to reduce duplicate builds of same
  6424b78... build: don't clean externally created temporary files
  a0a855e... build: add linker version script for executables
  c448e29... service: make static ValidProperty table const
  8fe1e93... service: remove "nm-openvpn-service.h" header
  2cfe833... build: merge branch 'th/build-non-recursive-make'