starting "ticks"
validate arguments to compile_vstudio
fix warnings reported by clang-cl
vstudio compilation
clang on windows with vs2013
use clang-cl front end on CLIENT0170
Revert "vstudio compilation"

Let's see if compiling with clang-cl works

This reverts commit 0e7909325a16652c105cfe27d278dedff0e05d3c.