package/mtd: fix musl compile

Update rpmatch patch to commit 5923077649ca167991a24ca05bd285fdf6fa1a06 and
expand to musl. Rename it.

Add more patches to fix compile issues with musl.

Patches sent upstream:
1) "include/common.h: fix build against musl"
   http://patchwork.ozlabs.org/patch/464074/
2) "lib/libfec.c: fix build against musl"
   http://patchwork.ozlabs.org/patch/464073/
3) "serve_image: do not include error.h"
   http://patchwork.ozlabs.org/patch/464416/
4) "recv_image: do not include error.h"
   http://patchwork.ozlabs.org/patch/464417/



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