Revert "mimalloc: use "weak" random seed when statically linked"

In preparation for upgrading to a newer mimalloc version; This patch
will not be needed anymore, as it has been implemented in a slightly
different form in upstream mimalloc: 3e1d800e (potential fix for windows
static linking with thread creation in dll's, 2022-11-07).

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

compat/mimalloc/init.c

@@ -302,11 +302,7 @@ static bool _mi_heap_init(void) {
     _mi_memcpy_aligned(tld, &tld_empty, sizeof(*tld));
     _mi_memcpy_aligned(heap, &_mi_heap_empty, sizeof(*heap));
     heap->thread_id = _mi_thread_id();
-    #if defined(_WIN32) && !defined(MI_SHARED_LIB)
-    _mi_random_init_weak(&heap->random); // match mi_heap_main_init()
-    #else
     _mi_random_init(&heap->random);
-    #endif
     heap->cookie  = _mi_heap_random_next(heap) | 1;
     heap->keys[0] = _mi_heap_random_next(heap);
     heap->keys[1] = _mi_heap_random_next(heap);