update CI/Makefile

1 job for master in 7 minutes and 41 seconds
Status Job ID Name Coverage
  Build
failed #12254
fp
build-iris.dev

00:07:41

 
Name Stage Failure
failed
build-iris.dev Build
Makefile.coq:318: recipe for target 'all' failed
make[1]: *** [all] Error 2
Makefile:6: recipe for target 'all' failed
make: *** [all] Error 2

real 4m21.678s
user 16m2.240s
sys 0m20.847s
ERROR: Job failed: exit code 1