gh-81057: Move More Globals in Core Code to _PyRuntimeState (gh-99516)

https://github.com/python/cpython/issues/81057

Include/internal/pycore_pyhash.h

@@ -5,6 +5,36 @@
 #  error "this header requires Py_BUILD_CORE define"
 #endif
 
+
+struct pyhash_runtime_state {
+    struct {
+#ifndef MS_WINDOWS
+        int fd;
+        dev_t st_dev;
+        ino_t st_ino;
+#else
+    // This is a placeholder so the struct isn't empty on Windows.
+    int _not_used;
+#endif
+    } urandom_cache;
+};
+
+#ifndef MS_WINDOWS
+# define _py_urandom_cache_INIT \
+    { \
+        .fd = -1, \
+    }
+#else
+# define _py_urandom_cache_INIT {0}
+#endif
+
+#define pyhash_state_INIT \
+    { \
+        .urandom_cache = _py_urandom_cache_INIT, \
+    }
+
+
 uint64_t _Py_KeyedHash(uint64_t, const char *, Py_ssize_t);
 
-#endif
+
+#endif  // Py_INTERNAL_HASH_H