Made the MATLAB_MEX_FILE #define get set globally to avoid any possibility of

ODR violations.

dlib/matlab/cmake_mex_wrapper

@@ -54,7 +54,8 @@ INCLUDE_DIRECTORIES("${dlib_matlab_binding_path}")
 # Also add dlib to the include search path 
 INCLUDE_DIRECTORIES(${dlib_matlab_binding_path}/../..) 
 
-ADD_DEFINITIONS(-DMATLAB_MEX_FILE)
+include(${dlib_matlab_binding_path}/../add_global_compiler_switch.cmake)
+add_global_define(MATLAB_MEX_FILE)
 
 # Determine the path to our CMakeLists.txt file.  This is the file that
 # includeded the one you are reading right now.  So here we make it so that