Check if there is a release signingConfig.

F-Droid strips the signingConfigs section from build.gradle, so
buildTypes mustn't check if there is a release signing configuration.
Without breakpad, removed binaries.
More binaries removed.
Don't ignore config-version.h
Updated native subprojects from ics-openvpn.
Gitignore ovpnlibs
Remove connectedCheck test before assembleRelease.
Revert "Updated native subprojects from ics-openvpn."

This reverts commit d0e7ba3029b2fd42582413aa95773fe7dbdede90.

I'll postpone this work for the next cycle, it's not trivial because it doesn't link properly.
Merge branch 'feature/Release-process-should-include-F-Droid-and-Google-Play-Store-publication-#2316' into develop