buildserver: use hg 3.9 from backports

diff --git a/buildserver/provision-apt-get-install b/buildserver/provision-apt-get-install
index 4b7e1d385191412f3cff08881b3b67877daffd1a..0d352d138305257bb51d4604325d0d21797d86f8 100644 (file)
--- a/buildserver/provision-apt-get-install
+++ b/buildserver/provision-apt-get-install
@@ -71,7 +71,7 @@ packages="
  libtool-bin/testing
  make
  maven
- mercurial
+ mercurial/jessie-backports
  nasm
  nodejs
  openjdk-8-jre-headless