package/mdadm: not available in static builds

http://git.neil.brown.name/?p=mdadm.git;a=commitdiff;h=7716570e6d906e7326f83d466f6ba73009649d03#patch9
added code to include dlfcn.h.

Fixes
http://autobuild.buildroot.net/results/163/163ad5a9f976662be8ca8664f91254f90fca8439/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
1 file changed