use patched dtls lib

projects/pion-dtls/config

 # vim: filetype=yaml sw=2
 version: '[% c("abbrev") %]'
-git_url: https://github.com/pion/dtls
-git_hash: d2f797183a9f044ce976e6df6f362662ca722412 #v2.1.5
+git_url: https://github.com/ValdikSS/dtls
+git_hash: 4942a24bd5434abd7cb63050d749efa30d467370 #patch-support_group
 filename: '[% project %]-[% c("version") %]-[% c("var/osname") %]-[% c("var/build_id") %].tar.gz'
 
 build: '[% c("projects/go/var/build_go_lib") %]'