Add missing include path lib/common for cmd/edgepaint.
Merge pull request #21 from yak1ex/missing_include_path_for_cmd_edgepaint

Add missing include path lib/common for cmd/edgepaint.
Odd that configure on linux and osx automatically adds -Ilib/common. I guess the cyqwin processing is different. In any case, it is a benign change and makes dependencies more explicit.