CMake: rewrite gurobi finder:

- find any version of GUROBI based on the GUROBI_HOME env var (suggested
by Gurobi docs).
- compile C++ library ourselves to avoid toolchain/ABI mismatches
6 jobs for cmake-gurobi in 7 minutes and 36 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #81962
Qt551 VS2013
CoMISo-VS2013-Qt-5.5.1-x64

00:01:04

passed #81963
IPOPT3129 VS2017
CoMISo-VS2017-Qt-5.10.1-x64

00:01:09

passed #81960
Linux
clang-c++11

00:07:33

passed #81959
Linux
gcc-c++11

00:06:55

passed #81961
Apple
macos-c++11

00:04:47

 
  Deploy
passed #81964
trigger_build

00:00:02