ifdef out dynstr so mathutils can be compiled as an external module again.

source/blender/python/mathutils/mathutils.c

@@ -35,7 +35,10 @@
 
 #include "BLI_math.h"
 #include "BLI_utildefines.h"
-#include "BLI_dynstr.h"
+
+#ifndef MATH_STANDALONE
+#  include "BLI_dynstr.h"
+#endif
 
 PyDoc_STRVAR(M_Mathutils_doc,
 "This module provides access to matrices, eulers, quaternions and vectors."
@@ -312,6 +315,7 @@ int EXPP_VectorsAreEqual(const float *vecA, const float *vecB, int size, int flo
 	return 1;
 }
 
+#ifndef MATH_STANDALONE
 /* dynstr as python string utility funcions, frees 'ds'! */
 PyObject *mathutils_dynstr_to_py(struct DynStr *ds)
 {
@@ -324,6 +328,7 @@ PyObject *mathutils_dynstr_to_py(struct DynStr *ds)
 	PyMem_Free(ds_buf);
 	return ret;
 }
+#endif
 
 /* silly function, we dont use arg. just check its compatible with __deepcopy__ */
 int mathutils_deepcopy_args_check(PyObject *args)