Upgrade QuickJS.

Author: PetterS

setup.py

@@ -17,7 +17,7 @@
  import distutils.cygwinccompiler
  distutils.cygwinccompiler.get_msvcr = lambda: []
  # Escaping works differently.
- CONFIG_VERSION = '\\"2019-07-09\\"'
+ CONFIG_VERSION = '\\"2019-07-21\\"'
  # Make sure that pthreads is linked statically, otherwise we run into problems
  # on computers where it is not installed.
  extra_link_args = ["-Wl,-Bstatic", "-lpthread"]

third-party/libregexp.c

@@ -2407,7 +2407,7 @@ static intptr_t lre_exec_backtrack(REExecContext *s, uint8_t **capture,
  for(;;) {
  res = lre_exec_backtrack(s, capture, stack, stack_len,
  pc1, cptr, TRUE);
- if (res < 0)
+ if (res == -1)
  return res;
  if (!res)
  break;