uci: update to git HEAD

uci: update to git HEAD

5de3871 cli: drop redundant uci_add_delta_path() call for -P
f49a2fd delta: simplify uci_load_delta() by using a helper
9b6605e uci: fix use-after-free uci_set on update option
b7ceda9 uci: maintain option position in uci_set
7e01d66 uci: optimize update option in uci_set
47697e6 uci: fix use-after-free uci_add_list
74f2797 uci: fix atomicity of uci_add_list
b2f3417 uci: maintain option position in uci_add_list
16e8a3b uci: fix memory leak uci_set on update section
ae61e1c uci: optimize update section in uci_set
04d0c46 uci: macro uci_alloc_element not in uci.h

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>