ucode: update to latest Git HEAD

ucode: update to latest Git HEAD

11adf0c source: convert source objects into proper uc_value_t type
3a49192 treewide: rework function memory model
7edad5c tests: add functional tests for builtin functions
d5003fd lib: fix leaking tokener in uc_json() on parse exception
5d0ecd9 lib: fix infinite loop on empty regexp matches in uc_replace()
3ad57f1 lib: fix infinite loop on empty regexp matches in uc_match()
32d596d lib: fix infinite loop on empty regexp matches in uc_split()
3e3f38d vm: ensure consistent trace output between gcc and clang compiled ucode
3600ded vm: fix leaking function value on call exception
3059295 vm: NULL-initialize pointer to make cppcheck happy
98e59bf source: zero-initialize conversion union to make cppcheck happy
7a65c14 run_tests.sh: change workdir to testcase directory during execution
afec8d7 run_tests.sh: support placing supplemental testcase files
3ada6e0 run_tests.sh: always treat outputs as text data
2cb627f program: rename bytecode load/write functions, track path of executed file
1094ffa lib: fix memory leak in uc_require_ucode()

Signed-off-by: Jo-Philipp Wich <jo@mein.io>