#6771 Stopped parallel builds and added u16 to workers

For some reason Ubuntu 16 didn't like running in parallel and as azure doesn't git
many core disabling multicore building doesn't affect the time that much

CI/Linux/linux-build.yml

@@ -66,7 +66,6 @@ steps:
 
   - script: |
       dch --create --package "synergy" --controlmaint --distribution unstable --newversion $SYNERGY_DEB_VERSION "Initial release"
-      export DEB_BUILD_OPTIONS="parallel=8"
       export GPG_TTY=$(tty)
       debuild --preserve-envvar SYNERGY_* --preserve-envvar GIT_COMMIT -us -uc
       mkdir standard_package
@@ -87,7 +86,6 @@ steps:
   - script: |
       export SYNERGY_ENTERPRISE=1
       dch --create --package "synergy-enterprise_" --controlmaint --distribution unstable --newversion $(SYNERGY_DEB_VERSION) "Initial release"
-      export DEB_BUILD_OPTIONS="parallel=8"
       export GPG_TTY=$(tty)
       debuild --preserve-envvar SYNERGY_* --preserve-envvar GIT_COMMIT -us -uc
       mkdir enterprise_package

azure-pipelines.yml

@@ -10,6 +10,10 @@ jobs:
 
     strategy:
       matrix:
+        ubuntu1604:
+          image: symless/synergy-core:ubuntu16.04
+          packager: deb
+          name: ubuntu16
         ubuntu1804:
           image: symless/synergy-core:ubuntu18.04
           packager: deb