[vfrnav/f18] (16 commits) ...Merge remote-tracking branch 'origin/master' into f18

[sailer]

Summary of changes:

  a40bd81... rebuild for geos (*)
  17384f6... hopefully work around crashing epstopdf (*)
  31452e0... auto-reconfiguration (*)
  6024b81... fix svg workaround patch (*)
  764a89c... rebuild for polyclipping (*)
  75613e7... work around API changes of polyclipping 5.1 (*)
  40fe998... add -pthread to cfmuvalidate build (*)
  00c74ab... more pthread (*)
  4dabf03... another -pthread (*)
  da19952... another pthread (*)
  f1390c8... another pthread (*)
  4e5e6ad... put flag into LDFLAGS (*)
  045c057... another missing pthread (*)
  595a322... update & rebuild for geos (*)
  6d1f84d... add missing file (*)
  20473ec... Merge remote-tracking branch 'origin/master' into f18

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