c2g|stress: stop race in initializing array of randoms

From a usage point of view this fixes c2g and stress multi-threaded, the
results remain non-reproducable, issue #125 is not fully fixed though -
since now the random numbers used are still racy when multi-threaded.
14 jobs for master in 5 minutes and 7 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Dependencies
passed #308288
babl-git-autotools

00:02:38

passed #308289
babl-git-meson

00:01:36

failed #308290
babl-min-autotools

00:01:21

failed #308291
babl-min-meson

00:01:51

passed #308292
intel-ocl-runtime

00:05:05

 
  Gegl
skipped #308297
build-all-git-autotools
skipped #308298
build-all-git-meson
skipped #308299
build-all-min-autotools
skipped #308300
build-all-min-meson
skipped #308293
build-default-git-autotools
skipped #308294
build-default-git-meson
skipped #308295
build-default-min-autotools
skipped #308296
build-default-min-meson
skipped #308301
opencl-build-all-git-meson
 
Name Stage Failure
failed
babl-min-meson Dependencies
(12/12) Rebuilding certificate stores...
$ git clone --depth=$GIT_DEPTH https://gitlab.gnome.org/GNOME/babl.git _babl
Cloning into '_babl'...
$ cd _babl
$ mkdir _build
$ grep babl_required_version ../configure.ac | grep -o '[0-9]*\.[0-9]*\.[0-9]*' | sed 's/\./_/g' > .babl_min_version
$ git fetch --no-tags origin "refs/tags/BABL_`cat .babl_min_version`:refs/tags/MIN_VERSION"
fatal: couldn't find remote ref refs/tags/BABL_0_1_63
ERROR: Job failed: exit code 1
failed
babl-min-autotools Dependencies
(12/12) Rebuilding certificate stores...
$ git clone --depth=$GIT_DEPTH https://gitlab.gnome.org/GNOME/babl.git _babl
Cloning into '_babl'...
$ cd _babl
$ mkdir _build
$ grep babl_required_version ../configure.ac | grep -o '[0-9]*\.[0-9]*\.[0-9]*' | sed 's/\./_/g' > .babl_min_version
$ git fetch --no-tags origin "refs/tags/BABL_`cat .babl_min_version`:refs/tags/MIN_VERSION"
fatal: couldn't find remote ref refs/tags/BABL_0_1_63
ERROR: Job failed: exit code 1