[package] minidlna: update to 1.0.21

[package] minidlna: update to 1.0.21

010-genconfig-checks.patch adjusts two configure checks to use ICONV_PREFIX and INTL_PREFIX. These changes were already made previously elsewhere in the build process and looks like it was just overlooked here.

040-configuration-tweak.patch was to rebase.

Minidlna's changes were primarily bug fixes and compatibility with newer ffmpeg.

Signed-off-by: Ian Leonard <antonlacon@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/packages@28031 3c298f89-4303-0410-b956-a3cf2f4a3e73