Log Message:
cmark: updated to 0.31.1

0.31.1

* Flag root node as open in `cmark_parser_new_with_mem_into_root`

* Remove `source`, add `search` to list of block tags
  (a spec 0.31 change we forgot in last release).

* Accept lowercase inline HTML declarations (Michael Howell).

* Remove unused functions (Nick Wellnhofer).

* utf8:

  + Fix encoding of U+FFFE and U+FFFF
  + Rework case folding (Nick Wellnhofer).  Using a table and binary
    search instead of a generated switch statement significantly
    reduces the size of the compiled code.

* houdini:

  + Rename `houdini_escape_html0` -> `houdini_escape_html`
  + Rework HTML entity table (Nick Wellnhofer).
    The new layout saves about 20 KB and removes 50 KB of relocation
    entries from the shared library, also speeding up loading.

* cmake:

  + Tell cmake to set `rpath` so the installed `cmark` can find
    `libcmark.so` (Michael Witten).
  + Remove unnecessary enabling of target property: MACOSX_RPATH
    (Michael Witten).
  + Fix build type checks (Nick Wellnhofer). Make the libFuzzer
    target use the Asan build type again.

* Makefile:

  + Fix `libFuzzer` target (Nick Wellnhofer).
  + Use `ctest` and `--output-on-failure` in `test` target.
  + `make debug` should build a shared library (Nick Wellnhofer).
    The full test suite is only available to a shared library build.

* wrappers:

  + Fix memory leak in Ruby wrapper (Nick Wellnhofer).
    Free the string returned from `cmark_markdown_to_html`.
    Fix `cmark_markdown_to_html` argument types.
  + Fix memory leak in Python wrapper (Nick Wellnhofer).
    Free the string returned from cmark_markdown_to_html.
    Fix cmark_markdown_to_html argument types.
  + Convert to and from UTF-8 under Python 2.
  + Add PHP wraper (Vinicius Dias).

* ci:

  + Test with ASan and rework CI matrix (Nick Wellnhofer).
  + Remove the valgrind leakcheck test. This should be covered now
    by testing with LeakSanitizer on static builds, including tests
    like spectest_executable. The full test suite is only available
    to shared library builds which have to run without leak checks
    for now.
  + Separate cflags from cc (Nick Wellnhofer).
  + Make CMake matrix options work (Nick Wellnhofer).
    CMAKE_OPTIONS had no effect, leading to the shared library not being
    tested. Invoke cmake directly, so we don't have to deal with the mess
    in Makefile.
  + Do debug build so that assertions will run
  + Use `-gdwarf-4` with clang for compatibility with valgrind

* test:

  + Fix memory leaks in cmark.py (Nick Wellnhofer).
    Free results of libcmark API function calls.
  + Fix memory leaks in api_test (Nick Wellnhofer).
  + Simplify test execution environment handling (Saleem Abdulrasool).
    Use generator expressions to compute the new path and avoid
    translations. This reduces complexity in the build and allows for a
    different build layout.

* fuzz: Test more parser entry points (Nick Wellnhofer).

* Remove superfluous definitions from scanners.re.

* re2c: Disable UTF-8 (Nick Wellnhofer). The regexes don't require UTF-8
  features and work in ASCII mode as well. Disabling UTF-8 reduces the
  size of the code generated by re2c.