Fix win32 and cleanup code

Author: katzer

.appveyor.yml

@@ -53,6 +53,7 @@ init:
 - SET PATH=%COMPILER%\bin;%PATH%
 - SET PATH=C:\Ruby23-x64\bin;%PATH%
 - SET PATH=C:\cygwin\bin;%PATH%
+- SET PATH=C:\GnuWin\bin;%PATH%
 - gcc --version
 
 build_script: