[libc++] Remove now unused libc++ workers

Several libc++ jobs were removed in D91809, but I forgot to remove the workers
associated to those bots.

Differential Revision: https://reviews.llvm.org/D92426
diff --git a/buildbot/osuosl/master/config/builders.py b/buildbot/osuosl/master/config/builders.py
index 433258b..1142baf 100644
--- a/buildbot/osuosl/master/config/builders.py
+++ b/buildbot/osuosl/master/config/builders.py
@@ -21,14 +21,6 @@
 
 from buildbot.plugins import util
 
-# For Libc++ builders.
-docker_workers = [
-    'libcxx-cloud1', 'libcxx-cloud2', 'libcxx-cloud3', 'libcxx-cloud4',
-    'libcxx-cloud5'
-]
-
-benchmark_opts = ';'.join(
-    ['--benchmark_min_time=0.01', '--benchmark_color=false'])
 
 all = [
 
diff --git a/buildbot/osuosl/master/config/workers.py b/buildbot/osuosl/master/config/workers.py
index 8b57724..017787b 100644
--- a/buildbot/osuosl/master/config/workers.py
+++ b/buildbot/osuosl/master/config/workers.py
@@ -126,14 +126,6 @@
         # IBM z13 (s390x), Ubuntu 16.04.2
         create_worker("systemz-1", properties={'jobs': 4, 'vcs_protocol': 'https'}, max_builds=4),
 
-        # Debian 9, Docker based build. See libcxx/utils/docker.
-        create_worker('libcxx-cloud1', properties={'jobs': 64}, max_builds=1),
-        create_worker('libcxx-cloud2', properties={'jobs': 64}, max_builds=1),
-        create_worker('libcxx-cloud3', properties={'jobs': 64}, max_builds=1),
-        create_worker('libcxx-cloud4', properties={'jobs': 64}, max_builds=1),
-        create_worker('libcxx-cloud5', properties={'jobs': 64}, max_builds=1),
-
-
         # Windows Server 2012 x86_64 16-core GCE instance
         create_worker("sanitizer-windows", properties={'jobs': 16}, max_builds=1),
         # Windows Server 2012 x86_64 32-core GCE instance