buildroot

uclibc: add patch to fix <stdlib.h>

This commit adds a patch to <stdlib.h>, to fix a bug introduced in
uClibc-ng 1.0.20, and which was causing build failures for at least one
package in Buildroot: freeswitch.

Fixes:

  http://autobuild.buildroot.net/results/12c246b058224f68494b84355a29dc4efb85df6d/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>