DRAFT [thud] opencv_3.2: Patch "invalid conversion from 'const char*' to 'char*'" error

XXX When building with [thud], gcc has -fpermissive.

recipes-support/opencv/opencv/fixmissingconst.patch

@@ -0,0 +1,15 @@
+diff --git modules/python/src2/cv2.cpp modules/python/src2/cv2.cpp
+index e69e933375..11adc342cb 100644
+--- a/modules/python/src2/cv2.cpp
++++ b/modules/python/src2/cv2.cpp
+@@ -727,7 +727,7 @@ bool pyopencv_to(PyObject* obj, String& value, const char* name)
+     (void)name;
+     if(!obj || obj == Py_None)
+         return true;
+-    char* str = PyString_AsString(obj);
++    const char* str = PyString_AsString(obj);
+     if(!str)
+         return false;
+     value = String(str);
+
+

recipes-support/opencv/opencv_3.2.bb

@@ -32,6 +32,7 @@ SRC_URI = "git://github.com/opencv/opencv.git;name=opencv \
     file://0001-Make-opencv-ts-create-share-library-intead-of-static.patch \
     file://0001-To-fix-errors-as-following.patch \
     file://0001-tracking-make-opencv_dnn-dependancy-optional.patch;patchdir=../contrib/ \
+    file://fixmissingconst.patch \
 "
 
 PV = "3.2+git${SRCPV}"