[network-manager-pptp] (22 commits) ...all: merge branch 'th/vpn-editor-split-bgo766623'

[Thomas Haller <thaller src gnome org>]

Summary of changes:

  5142dca... build: update m4/compiler_warnings.m4 to support clang (*)
  c182979... service: fix invalid failure reason in pppd_timed_out() (*)
  b0fcdf6... gitignore: ignore cscope and pot files (*)
  b9904b2... build/trivial: rename define NM_PPTP_OLD to NM_VPN_OLD (*)
  9241331... properties/trivial: rename PPTP_PLUGIN_UI_ERROR to NMV_EDIT (*)
  25d052f... properties: remove unused pptp_plugin_ui_error_get_type() g (*)
  5bae0d8... properties: remove unused NMV_EDITOR_PLUGIN_ERROR error cod (*)
  79cab64... properties: replace pptp specific error codes by libnm/libn (*)
  76d580a... build: cleanup Makefile.am (*)
  57a7d3d... build: move "src/nm-pptp-service-defines.h" to "shared/nm-s (*)
  79703d9... shared: add shared files (*)
  4989afc... shared: use "nm-default.h" header (*)
  2706fe7... build: use stable libsecret-1 instead of libsecret-unstable (*)
  312b5fc... build: bump required libnm and NetworkManager version (*)
  af00b62... build: cleanup configure.ac (*)
  75b6779... properties: add linker version script to libnm plugin (*)
  2d54ebb... properties: split "nm-pptp-editor-plugin.c" out of "nm-pptp (*)
  1b1a923... properties: rename file "nm-pptp.c" to "nm-pptp-editor.c" (*)
  97abe6c... properties: remove unused "import-export.c" file (*)
  511c0a7... properties: split GTK dependent editor plugin (*)
  24021b5... build: don't install appdata when building --without-gnome (*)
  10133bc... all: merge branch 'th/vpn-editor-split-bgo766623'

(*) This commit already existed in another branch; no separate mail sent