Remove upstreamed stack.c workaround

patches/stack.c.patch

@@ -1,11 +0,0 @@
---- crypto/stack/stack.c.orig	Fri Jan  9 03:12:10 2026
-+++ crypto/stack/stack.c	Fri Jan  9 03:15:42 2026
-@@ -201,7 +201,7 @@
- obj_bsearch_ex(const void *key, const void *base_, int num, int size,
-     int (*cmp)(const void *, const void *))
- {
--	const void *base = base_;
-+	const char *base = base_; /* XXX - error C2036: 'const void *': unknown size */
- 	int l, h, i, c;
- 
- 	l = 0;