[ci] configure with CMAKE_POLICY_VERSION_MINIMUM=3.5 to allow Libxc building with recent cmake

Author: evaleev

.gitlab-ci.yml

@@ -20,6 +20,7 @@ variables:
     ${BLA_THREADS}
     ${TA_SCALAPACK}
     TA_TRACKED_MADNESS_URL=/root/github/madness
+    CMAKE_POLICY_VERSION_MINIMUM=3.5
 
 before_script:
   # NB: if CMAKE_BUILD_PARALLEL_LEVEL is not set (i.e. using shared runner), use 1 to ensure we have enough memory