Downgrade lack of libxslt from configure warning to notice

[Marcus Meissner]

On Sun, Jun 08, 2008 at 10:42:32PM +0200, Gerald Pfeifer wrote:
> On a test system of mine which does not feature too many packages I am
> getting the following:
> 
> configure: libsane development files not found, scanners won't be supported.
> configure: libgphoto2 development files not found, digital cameras won't be supported.
> configure: libldap (OpenLDAP) development files not found, LDAP won't be supported.
> configure: libcapi20 development files not found, ISDN won't be supported.
> configure: WARNING: libxslt development files not found, xslt won't be supported.
> 
> Looking that libxslt only seems to be used by msxml3, I am wondering
> whether this really is worth a warning?
> 
> How about the patch below?

It probably should be an error, since otherwise msxml3 is only
partial functional aka "broken".

Ciao, Marcus