message: Use 4 cores in each build matrix entry
diff: @@ -28,33 +28,40 @@ config = [
  buildMatrix: [
  // Various Linux builds for debug and release.
  ['centos-6', [
  + numCores: 4,
  tags: ['docker'],
  builds: ['debug', 'release'],
  extraDebugFlags: ['CAF_SANITIZERS:STRING=address,undefined'],
  ]],
  ['centos-7', [
  + numCores: 4,
  tags: ['docker'],
  builds: ['debug', 'release'],
  extraDebugFlags: ['CAF_SANITIZERS:STRING=address,undefined'],
  ]],
  ['ubuntu-16.04', [
  + numCores: 4,
  tags: ['docker'],
  builds: ['debug', 'release'],
  ]],
  ['ubuntu-18.04', [
  + numCores: 4,
  tags: ['docker'],
  builds: ['debug', 'release'],
  ]],
  ['fedora-30', [
  + numCores: 4,
  tags: ['docker'],
  builds: ['debug', 'release'],
  ]],
  ['fedora-31', [
  + numCores: 4,
  tags: ['docker'],
  builds: ['debug', 'release'],
  ]],
  // Other UNIX systems.
  ['macOS', [
  + numCores: 4,
  builds: ['debug', 'release'],
  extraFlags: [
  'OPENSSL_ROOT_DIR=/usr/local/opt/openssl',
  @@ -63,11 +70,13 @@ config = [
  extraDebugFlags: ['CAF_SANITIZERS:STRING=address,undefined'],
  ]],
  ['FreeBSD', [
  + numCores: 4,
  builds: ['debug', 'release'],
  extraDebugFlags: ['CAF_SANITIZERS:STRING=address,undefined'],
  ]],
  // Non-UNIX systems.
  ['Windows', [
  + numCores: 4,
  // TODO: debug build currently broken
  //builds: ['debug', 'release'],
  builds: ['release'],
  