Patches for error.h and error.c

[Neil Mitchell]

Hi,

Attached is a patch for error.h/.c.

Some comments:

The WinHugs specific bit now uses int instead of INT, so its not
dependant on windows.h

The error message on compile time errors now puts out a hyperlink,
this is #if'd so shouldn't change non WinHugs. This allows WinHugs
users to click when an error occurs and be brought to that location in
their editor.

Instead of proding MessageBox(hWnd), I have defined InfoBox and
ErrorBox which WinHugs does something sensible with.

The header file uses cleaner interaction with WinHugs, instead of
poking the magic hWnd..

Thanks

Neil
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