fix PR autobuild for ubuntu-18.04, android with correct cmake version (#1225)

Author: ArcadeFever

.github/workflows/pr_build.yml

@@ -188,6 +188,16 @@ jobs:
           done
         }
         retry cmake --build . --config $BUILD_TYPE --target package $CMAKE_BUILD_EXTRA
+    # As of 05/17/21 GitHub Virtual Environments changed their "Ubuntu 18.04.5 LTS" image to include two versions of CMake for Android
+    # https://github.com/actions/virtual-environments/blob/ubuntu18/20210517.1/images/linux/Ubuntu1804-README.md
+    # Removing 3.18.1 version of CMake as its not compatible with our Android build.
+    # It will fall back to 3.10.2 which is already installed
+    - name: Nuke CMake 3.18.1-g262b901
+      if: matrix.build_type == 'android'
+      shell: bash
+      working-directory: ${{runner.workspace}}/vircadia
+      run: |
+        /usr/local/lib/android/sdk/tools/bin/sdkmanager --uninstall 'cmake;3.18.1'
     - name: Build for Android + Quest
       if: matrix.build_type == 'android'
       shell: bash