Remove the workarounds for waf bug #37

examples/a/wscript

@@ -25,6 +25,4 @@ def build(bld):
         ]
     obj.target = 'a'
     obj.inst_var = 0 # do not install
-
-    ## Workaround a WAF bug (http://code.google.com/p/waf/issues/detail?id=37)
-    obj.env.append_value("CPPPATH", bld.m_curdirnode.srcpath(obj.env))
+    obj.includes = '.'