uci: update to the latest version

uci: update to the latest version

c4df32b file: remove redundant NULL check on return value of uci_realloc()
5d08b7f build: fix BUILD_STATIC
49ec6ef Fix skipping directories in uci_list_config_files
c203c2f Revert "mandatory anonymous section identifier"
0a1a2fc uci/lua: add explicit close() method
7daf942 uci/lua: add list_configs() function
fe45f97 test: adjust for auto-naming anonymous sections
2eb9c09 cli: remove now-defunct UCI_FLAG_EXPORT_NAME support
df72af4 mandatory anonymous section identifier

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>