libShake: fix gcc 15 compilation due incorrect listElementDelete defi…

[cscd98]

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2. If you are sending several unrelated fixes or features, use a branch and a separate pull request for each
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Description

Compiling RetroArch under GCC 15 will fail with:

deps/libShake/src/common/helpers.c:19:14: error: conflicting types for ‘listElementDelete’; have ‘ListElement *(ListElement *, ListElement *, void (*)(void *))’
   19 | ListElement *listElementDelete(ListElement *head, ListElement *toDelNode, void(*itemDel)(void *item))
      |              ^~~~~~~~~~~~~~~~~
In file included from deps/libShake/src/common/helpers.c:1:
deps/libShake/src/common/helpers.h:11:14: note: previous declaration of ‘listElementDelete’ with type ‘ListElement *(ListElement *, ListElement *, void (*)(void))’
   11 | ListElement *listElementDelete(ListElement *head, ListElement *toDelNode, void(*itemDel)());

This fixes that.

Same PR made to libShake.

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