pass system name to xrceagent (#110) (#112)

(cherry picked from commit 8aea206)

Co-authored-by: Roland Schwan <[email protected]>

Author: mergify[bot]

micro_ros_agent/cmake/SuperBuild.cmake

@@ -42,6 +42,7 @@ if(NOT xrceagent_FOUND)
                 -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>
                 -DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}
                 -DCMAKE_PREFIX_PATH:PATH=<INSTALL_DIR>
+                -DCMAKE_SYSTEM_NAME:STRING=${CMAKE_SYSTEM_NAME}
                 -DUAGENT_USE_SYSTEM_FASTDDS:BOOL=ON
                 -DUAGENT_USE_SYSTEM_FASTCDR:BOOL=ON
                 -DUAGENT_CED_PROFILE:BOOL=OFF