orctest: Fix ULP compare and make compatible with clang

4 jobs for fix_ulp in 1 minute and 41 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #556671
debian sid

00:01:41

passed #556674
docker windows 1607
msys2

00:01:12

passed #556672
docker windows 1607
vs2017 amd64

00:01:14

passed #556673
docker windows 1607
vs2017 x86

00:01:18