BLF: make blurry text an optional (disabled) feature

While trying to simplify text drawing, noticed no Blender code uses the blur feature. Hopefully scripts don't use it!

source/blender/python/generic/blf_py_api.c

@@ -114,6 +114,7 @@ static PyObject *py_blf_aspect(PyObject *UNUSED(self), PyObject *args)
 }
 
 
+#if BLF_BLUR_ENABLE
 PyDoc_STRVAR(py_blf_blur_doc,
 ".. function:: blur(fontid, radius)\n"
 "\n"
@@ -135,6 +136,7 @@ static PyObject *py_blf_blur(PyObject *UNUSED(self), PyObject *args)
 
 	Py_RETURN_NONE;
 }
+#endif
 
 
 PyDoc_STRVAR(py_blf_draw_doc,
@@ -418,7 +420,9 @@ static PyObject *py_blf_unload(PyObject *UNUSED(self), PyObject *args)
 /*----------------------------MODULE INIT-------------------------*/
 static PyMethodDef BLF_methods[] = {
 	{"aspect", (PyCFunction) py_blf_aspect, METH_VARARGS, py_blf_aspect_doc},
+#if BLF_BLUR_ENABLE
 	{"blur", (PyCFunction) py_blf_blur, METH_VARARGS, py_blf_blur_doc},
+#endif
 	{"clipping", (PyCFunction) py_blf_clipping, METH_VARARGS, py_blf_clipping_doc},
 	{"word_wrap", (PyCFunction) py_blf_word_wrap, METH_VARARGS, py_blf_word_wrap_doc},
 	{"disable", (PyCFunction) py_blf_disable, METH_VARARGS, py_blf_disable_doc},