Fix T46799: Blender crashes when enumerating POCL devices

The issue was caused by a conflict between std::error_code linked into
Blender which is compiled without C++11 support and POCL's expectations
of std::error_code which was actually linked against C++11's STL.

source/creator/blender.map

@@ -9,6 +9,7 @@ global:
 	*;
 	*_boost*;
 local:
+	*default_error_condition*;
 	*llvm*;
 	*LLVM*;
 	decodeInstruction;