GCC10 defaults to -fno-common, which breaks compilation when there are
multiple definitions of implicit "extern" variables. Remove the extra
definitions.

Signed-off-by: Tony Ambardar <itugrok@yahoo.com>

Signed-off-by: Jan Pavlinec <jan.pavlinec@nic.cz>

fix Makefile chmod (644)
replace MD5SUM with HASH
add PKG_MIRROR_HASH when PKG_SOURCE_PROTO:=git

(PKG_SOURCE_PROTO:=svn tarballs are not reproducible for now)

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

default C standard changed in gcc5 so set old variant

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>