remove hard coded CMAKE_BUILD_TYPE

Author: christian-rauch

orbbec_camera/CMakeLists.txt

@@ -7,7 +7,6 @@ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC -O3")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}  -fPIC -g3")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC -O3")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fPIC -g3")
-set(CMAKE_BUILD_TYPE "Release")
 option(USE_RK_HW_DECODER "Use Rockchip hardware decoder" OFF)
 option(USE_NV_HW_DECODER "Use Nvidia hardware decoder" OFF)