Fix: Clone cppcheck via SSH.

Cloning cppcheck randomly failed due to the http download with the following error message:

Cloning into 'cppcheck'...
error: RPC failed; curl 92 HTTP/2 stream 0 was not closed cleanly: CANCEL (err 8)
error: 6514 bytes of body are still expected
fetch-pack: unexpected disconnect while reading sideband packet
fatal: early EOF
fatal: fetch-pack: invalid index-pack output

My hope ist, that with the increased buffer size this problem will be solved. (from here: https://docs.gitlab.com/ee/topics/git/troubleshooting_git.html)

utilities/install-cppcheck.sh

@@ -5,8 +5,8 @@
 set -e
 
 cd /tmp
-git clone https://github.com/danmar/cppcheck.git
-cd cppcheck 
+git clone git@github.com:danmar/cppcheck.git
+cd cppcheck
 git checkout 2.10.3
 make MATCHCOMPILER=yes FILESDIR=/usr/share/cppcheck HAVE_RULES=yes CXXFLAGS="-O2 -DNDEBUG -Wall -Wno-sign-compare -Wno-unused-function" install
 cd /tmp