SuperBuild: pass C & CXX compiler to ExternalProject call

SuperBuild/CMakeLists.txt

@@ -150,8 +150,12 @@ if(UNIX)
   endif()
 endif()
 
+
+
 set(SB_CMAKE_ARGS)
 list(APPEND SB_CMAKE_ARGS "-G${CMAKE_GENERATOR}")
+list(APPEND SB_CMAKE_ARGS "-DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}")
+list(APPEND SB_CMAKE_ARGS "-DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}")
 
 set(SB_CMAKE_COMMAND ${CMAKE_COMMAND} ${SB_CMAKE_ARGS})