package/vlc: Remove warning from Config.in

package/vlc: Remove warning from Config.in

Four years ago this warning was added to this package
https://git.buildroot.net/buildroot/commit/package/vlc?id=e33019aaa0409e35b725dddffe09e3e2a42959d1
due to "autobuilder failures for vlc on many platforms".

The last autobuilder failure occured May 1st, 2018 and was fixed by
https://git.buildroot.net/buildroot/commit/package/vlc?id=9f115bfc2ac798c737d0c2a8ec8c96670e814a49

Therefore this warning is not needed anymore.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>