[fpc-devel]Fix for Make / Error with space in PATH env var

[Peter Vreman]

> I originally posted this to fpc-pascal but didn't get much of a response.
> The problem where having spaces in the environmental variable will error
> out the Make process has been described.
>
> Here is a work around I came up with:
>
> It seems to work on my system.  Could someone check this out and add to
> code base if okay?

It looks like a hack. Maybe it can fix this issue for pwd.exe, but it
occurres more often in Makefiles. Those other parts will then still fail.