missing includes

Former-commit-id: 04ec0863b88ae8f634e47ddb706f7f9cbc2d1b40

include/igl/matlab/requires_arg.cpp

@@ -6,8 +6,8 @@
 // v. 2.0. If a copy of the MPL was not distributed with this file, You can 
 // obtain one at http://mozilla.org/MPL/2.0/.
 #include "requires_arg.h"
-#include "../C_STR.h"
 #include "mexErrMsgTxt.h"
+#include "../C_STR.h"
 
 IGL_INLINE void igl::matlab::requires_arg(const int i, const int nrhs, const char *name)
 {

include/igl/matlab/validate_arg.cpp

@@ -7,6 +7,8 @@
 // obtain one at http://mozilla.org/MPL/2.0/.
 #include "validate_arg.h"
 #include "requires_arg.h"
+#include "mexErrMsgTxt.h"
+#include "../C_STR.h"
 
 IGL_INLINE void igl::matlab::validate_arg_scalar(
     const int i, const int nrhs, const mxArray * prhs[], const char * name)