brew: test fix for new tbb with gazebo (#652)

Don't set tbb@2020_u3 variables if github branch
name matches replace_deprecated_tbb_task, which
allows testing of gazebosim/gazebo-classic#3174.

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

jenkins-scripts/lib/project-default-devel-homebrew-amd64.bash

@@ -136,9 +136,11 @@ if brew ruby -e "exit ! '${PROJECT_FORMULA}'.f.recursive_dependencies.map(&:name
 fi
 # Workaround for tbb@2020_u3: set CPATH, LIBRARY_PATH, and CMAKE_PREFIX_PATH
 if brew ruby -e "exit ! '${PROJECT_FORMULA}'.f.recursive_dependencies.map(&:name).keep_if { |d| d == 'tbb@2020_u3' }.empty?"; then
-  export CMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}:/usr/local/opt/tbb@2020_u3
-  export CPATH=${CPATH}:/usr/local/opt/tbb@2020_u3/include
-  export LIBRARY_PATH=${LIBRARY_PATH}:/usr/local/opt/tbb@2020_u3/lib
+  if [ "${ghprbSourceBranch}" != "replace_deprecated_tbb_task" ]; then
+    export CMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}:/usr/local/opt/tbb@2020_u3
+    export CPATH=${CPATH}:/usr/local/opt/tbb@2020_u3/include
+    export LIBRARY_PATH=${LIBRARY_PATH}:/usr/local/opt/tbb@2020_u3/lib
+  fi
 fi
 # Workaround for tinyxml2 6.2.0: set CMAKE_PREFIX_PATH and PKG_CONFIG_PATH if we are using tinyxml2@6.2.0
 if brew ruby -e "exit ! '${PROJECT_FORMULA}'.f.recursive_dependencies.map(&:name).keep_if { |d| d == 'tinyxml2@6.2.0' }.empty?"; then