Fix special builds

.github/workflows/build-special.yml

@@ -91,21 +91,21 @@ jobs:
 
       - name: Set Allow Deprecated Flag
         if: matrix.flag == 'deprecated'
-        env:
-          GTSAM_ALLOW_DEPRECATED_SINCE_V41: ON
-        run: echo "Allow deprecated since version 4.1"
+        run: |
+          echo "::set-env name=GTSAM_ALLOW_DEPRECATED_SINCE_V41::ON"
+          echo "Allow deprecated since version 4.1"
 
       - name: Set Use Quaternions Flag
         if: matrix.flag == 'quaternions'
-        env:
-          GTSAM_USE_QUATERNIONS: ON
-        run: echo "Use Quaternions for rotations"
+        run: |
+          echo "::set-env name=GTSAM_USE_QUATERNIONS::ON"
+          echo "Use Quaternions for rotations"
 
       - name: Set GTSAM_WITH_TBB Flag
         if: matrix.flag == 'tbb'
-        env:
-          GTSAM_WITH_TBB: ON
-        run: echo "GTSAM Uses TBB"
+        run: |
+          echo "::set-env name=GTSAM_WITH_TBB::ON"
+          echo "GTSAM Uses TBB"
 
       - name: Build & Test
         run: |