Fails to build from source with GCC 15 due to mismatched function declarations

[glaubitz]

Starting with GCC 15, function declarations must exactly match the definitions now.

As a result, tokenizers fails to build with GCC 15 since the parameter list for some function declarations do not match the definitions:

[   37s]   The following warnings were emitted during compilation:
[   37s] 
[   37s]   warning: [email protected]: oniguruma/src/regparse.c: In function 'onig_st_init_strend_table_with_size':
[   37s]   warning: [email protected]: oniguruma/src/regparse.c:588:5: error: initialization of 'int (*)(void)' from incompatible pointer type 'int (*)(st_str_end_key *, st_str_end_key *)' [-Wincompatible-pointer-types]
[   37s]   warning: [email protected]:   588 |     str_end_cmp,
[   37s]   warning: [email protected]:       |     ^~~~~~~~~~~
[   37s]   warning: [email protected]: oniguruma/src/regparse.c:588:5: note: (near initialization for 'hashType.compare')
[   37s]   warning: [email protected]: oniguruma/src/regparse.c:550:1: note: 'str_end_cmp' declared here
[   37s]   warning: [email protected]:   550 | str_end_cmp(st_str_end_key* x, st_str_end_key* y)
[   37s]   warning: [email protected]:       | ^~~~~~~~~~~
[   37s]   warning: [email protected]: oniguruma/src/regparse.c:589:5: error: initialization of 'int (*)(void)' from incompatible pointer type 'int (*)(st_str_end_key *)' [-Wincompatible-pointer-types]
[   37s]   warning: [email protected]:   589 |     str_end_hash,
[   37s]   warning: [email protected]:       |     ^~~~~~~~~~~~
[   37s]   warning: [email protected]: oniguruma/src/regparse.c:589:5: note: (near initialization for 'hashType.hash')
[   37s]   warning: [email protected]: oniguruma/src/regparse.c:571:1: note: 'str_end_hash' declared here
[   37s]   warning: [email protected]:   571 | str_end_hash(st_str_end_key* x)
[   37s]   warning: [email protected]:       | ^~~~~~~~~~~~