uci: update to version 2020-10-06

uci: update to version 2020-10-06

52bbc99f69ea Replace malloc() + memset() with calloc()
3fbd6c923434 ucimap: Check return of malloc()
eae126f66663 file: Check buffer size after strtok()
7f574273180a file: use size_t for position and pointer
19770b6949b9 file: use dynamic memory allocation for tempfile name
aa46546794ac file: uci_file_commit: fix memory leak
671c7554bfde uci: silence UBSAN error by using offsetof macro from compiler
ea5bbd57d0e1 tests: cram: add uci import testing on fuzzer corpus
31f78bfbf75f cmake: add uci-san cli built with clang sanitizers
a3e650911f5e file: uci_parse_package: fix heap use after free
9bd361ca3236 tests: add libFuzzer based fuzzing

Signed-off-by: Petr Štetiar <ynezz@true.cz>