Remove global from Typeclasses Opaque (not supported in Coq 8.7)

2 jobs for master in 5 minutes and 59 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #21098
fp
build-coq.8.7.2

00:04:50

passed #21097
fp-timing
build-coq.8.8.2

00:05:59

 
Name Stage Failure
failed
build-coq.8.7.2 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 3m59.181s
user 15m53.924s
sys 0m27.564s
ERROR: Job failed: exit code 1