A small bug: F# in $PATH

[Weijun Wang]

I'm trying to build 32-bit openjdk on a Windows machine. My Visual 
Studio 2010 installation includes F#, therefore the PATH variable in 
spec.gmk has the F#/bin directory at the beginning. It seems all 
characters after "#" is ignored because the make process complains 
"chdir: command not found".

After removing the F# related directories from $PATH, build runs fine.
-Max