rsyslog: rename libjson to json-c in DEPENDS

The libjson recipe was renamed to json-c in commit 533c1db2 of oe-core.

Signed-off-by: Olof Johansson <olof.johansson@axis.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
gitignore: Ignore Edit backup files, patches, .rej, .orig, .swp

Signed-off-by: Ulf Samuelsson <ulf@emagii.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>