asahi: Use the compat version of qsort_r

Not all platforms define qsort_r, util_qsort_r takes care of that.

CC: mesa-stable
Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25553>
(cherry picked from commit 4f48a140ac)

.pick_status.json

@@ -1234,7 +1234,7 @@
         "description": "asahi: Use the compat version of qsort_r",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null

src/asahi/compiler/agx_register_allocate.c

@@ -4,6 +4,7 @@
  */
 
 #include "util/u_dynarray.h"
+#include "util/u_qsort.h"
 #include "agx_builder.h"
 #include "agx_compiler.h"
 #include "agx_debug.h"
@@ -564,7 +565,7 @@ insert_copies_for_clobbered_killed(struct ra_ctx *rctx, unsigned reg,
       return;
 
    /* Sort by descending alignment so they are packed with natural alignment */
-   qsort_r(vars, nr_vars, sizeof(vars[0]), sort_by_size, rctx->sizes);
+   util_qsort_r(vars, nr_vars, sizeof(vars[0]), sort_by_size, rctx->sizes);
 
    /* Reassign in the destination region */
    unsigned base = reg;