Use new build convention for objects path

Author: emilmont

workspace_tools/toolchains/__init__.py

@@ -144,7 +144,7 @@ def __init__(self, target, options=None, notify=None):
         if self.options:
             self.info("Build Options: %s" % (', '.join(self.options)))
 
-        self.obj_path = join(target.name, self.name)
+        self.obj_path = join("TARGET_"+target.name, "TOOLCHAIN_"+self.name)
 
         self.symbols = None
         self.labels = None