patch: make it work ;)

[Harald Fernengel]

Hi,

Oswald Buddenhagen wrote:
> this patch replaces the use of $KDE_INCLUDES with $ac_kde_includes - the
> latter is expanded by KDE_EXPAND_MAKEVAR, thus being actually usable
> outside a makefile.
> this problem is probably present in other parts of kde as well, but so
> far i did not notice it. :)
> 
> apart from that, i converted some AC_TRY_LINKs to AC_TRY_COMPILEs and
> removed some unnecessary (afaics) includes. feel free to ignore at your
> liking.

Patch applied. Ossi, you rule again :)

Harry