CI: Enable goostring-format-checker clang checker

11 jobs for master in 8 minutes and 32 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #6421770
build

00:03:44

passed #6421775
build_android

00:00:44

passed #6421771
build_clang_libcpp

00:04:21

passed #6421774
build_clazy

00:03:10

passed #6421773
build_mingw64_fedora

00:03:12

passed #6421772
build_ubuntu_16_04

00:02:05

passed #6421769
clang_format

00:01:01

 
  Document
passed #6421777
cpp_docs

00:03:39

passed #6421778
glib_docs

00:03:59

passed #6421776
qt5_docs

00:03:48

 
  Publish
passed #6421779
trigger_pages

00:00:10