Trying mcmodel=medium to fix the failure in CMake static build

Author: ptrendx

CMakeLists.txt

@@ -176,6 +176,9 @@ else()
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O3")
   endif()
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_C_FLAGS}")
+  if(USE_CUDA)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mcmodel=medium")
+  endif()
 endif()
 
 if(NOT mxnet_LINKER_LIBS)