package/bsdiff: add patch to fix missing header for u_char

Fix missing header <sys/types.h> for u_char in bspatch.c.

Fixes http://autobuild.buildroot.net/results/31a/31a837cf6e34b02dce498f2b12e40d6d16a5a8e6/



Patch not sent upstream - no maintainer mail address or repository found.

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>