Fix openmp pragma

introduced in previous commit
4 jobs for master in 10 minutes and 23 seconds (queued for 9 minutes and 13 seconds)
Status Job ID Name Coverage
  Build
passed #506
build_debug

00:02:29

passed #507
build_opt

00:06:24

 
  Test
passed #508
test_debug

00:01:12

passed #509
test_opt

00:00:18