src/markupsafe/_speedups.c: build error with GCC14 [-Wincompatible-pointer-types]

[tgurr]

Environment:

• Python version: 3.12.7
• MarkupSafe version: 3.0.0

With GCC13 this was only a warning but with GCC14 (https://gcc.gnu.org/gcc-14/porting_to.html) these are now errors resulting in _speedups.cpython-312-x86_64-linux-gnu.so not being built.

2024-10-08 11:36:34,974 root INFO building 'markupsafe._speedups' extension
2024-10-08 11:36:34,975 root INFO creating build/temp.linux-x86_64-cpython-312/src/markupsafe
2024-10-08 11:36:34,975 root INFO x86_64-pc-linux-gnu-cc -fno-strict-overflow -Wsign-compare -DNDEBUG -fwrapv -march=native -O2 -pipe -march=native -O2 -pipe -fPIC -I/usr/x86_64-pc-linux-gnu/include/python3.12 -c src/markupsafe/_speedups.c -o build/temp.linux-x86_64-cpython-312/src/markupsafe/_speedups.o
src/markupsafe/_speedups.c: In function 'escape_unicode':
src/markupsafe/_speedups.c:163:45: error: passing argument 1 of 'escape_unicode_kind1' from incompatible pointer type [-Wincompatible-pointer-types]
  163 |                 return escape_unicode_kind1(s);
      |                                             ^
      |                                             |
      |                                             PyObject * {aka struct _object *}
src/markupsafe/_speedups.c:75:39: note: expected 'PyUnicodeObject *' but argument is of type 'PyObject *' {aka 'struct _object *'}
   75 | escape_unicode_kind1(PyUnicodeObject *in)
      |                      ~~~~~~~~~~~~~~~~~^~
src/markupsafe/_speedups.c:165:45: error: passing argument 1 of 'escape_unicode_kind2' from incompatible pointer type [-Wincompatible-pointer-types]
  165 |                 return escape_unicode_kind2(s);
      |                                             ^
      |                                             |
      |                                             PyObject * {aka struct _object *}
src/markupsafe/_speedups.c:101:39: note: expected 'PyUnicodeObject *' but argument is of type 'PyObject *' {aka 'struct _object *'}
  101 | escape_unicode_kind2(PyUnicodeObject *in)
      |                      ~~~~~~~~~~~~~~~~~^~
src/markupsafe/_speedups.c:167:45: error: passing argument 1 of 'escape_unicode_kind4' from incompatible pointer type [-Wincompatible-pointer-types]
  167 |                 return escape_unicode_kind4(s);
      |                                             ^
      |                                             |
      |                                             PyObject * {aka struct _object *}
src/markupsafe/_speedups.c:127:39: note: expected 'PyUnicodeObject *' but argument is of type 'PyObject *' {aka 'struct _object *'}
  127 | escape_unicode_kind4(PyUnicodeObject *in)
      |                      ~~~~~~~~~~~~~~~~~^~