Patch: Fix configure check for Xaw3d

[Michael Sperber]

Mike FABIAN <mfabian at suse.de> writes:

> Patch by Andreas Schwab <schwab at suse.de>.

> [...]

Thanks for patch.  Could you hint at what the problem it fixes is, so we
can cook up an informative ChangeLog entry?

-- 
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla