qemu-malloc.c: Remove qemu-specific heap routines.

Remove all uses of qemu_malloc/malloc0/realloc/free/strdup/etc to use
the equivalent GLib functions (g_malloc, g_free, ...) as per upstream.

This also removes qemu-malloc.c since it's no longer required.

Change-Id: I3c36a0396b73dd114b8da385b43f56a2e54dbb15
diff --git a/aio-android.c b/aio-android.c
index 9b6035f..50a59bb 100644
--- a/aio-android.c
+++ b/aio-android.c
@@ -76,13 +76,13 @@
                  * releasing the walking_handlers lock.
                  */
                 QLIST_REMOVE(node, node);
-                qemu_free(node);
+                g_free(node);
             }
         }
     } else {
         if (node == NULL) {
             /* Alloc and insert if it's not already there */
-            node = qemu_mallocz(sizeof(AioHandler));
+            node = g_malloc0(sizeof(AioHandler));
             node->fd = fd;
             QLIST_INSERT_HEAD(&aio_handlers, node, node);
         }
@@ -217,7 +217,7 @@
 
                 if (tmp->deleted) {
                     QLIST_REMOVE(tmp, node);
-                    qemu_free(tmp);
+                    g_free(tmp);
                 }
             }