Fix small bug in build script. (#12)

Requirements do not need to be installed in this pipeline.

ci_build_pipelines/stages/build/steps/restlerfullbuild.yml

@@ -35,11 +35,6 @@ steps:
       versionSpec: '3.8'
     name: pyTools
 
-  - script: |
-      pip install -r ./restler/requirements.txt
-      pip install -r ./demo_server/requirements.txt
-    displayName: Install requirements
-
   - script: |
       python ./build-restler.py --dest_dir $(Agent.BuildDirectory)/restler_drop
     failOnStderr: true