Jemalloc updated to 4.4.0.

The original jemalloc source tree was modified to:

1. Remove the configure error that prevents nested builds.
2. Insert the Redis private Jemalloc API in order to allow the
Redis fragmentation function to work.

deps/jemalloc/test/integration/sdallocx.c

@@ -1,7 +1,7 @@
 #include "test/jemalloc_test.h"
 
-#define	MAXALIGN (((size_t)1) << 25)
-#define	NITER 4
+#define	MAXALIGN (((size_t)1) << 22)
+#define	NITER 3
 
 TEST_BEGIN(test_basic)
 {