revert to using system compression libs, fixes #3797

we temporarily used the updated, bundled lz4 and zstd code for testing
purposes, but now going back to using system provided libs by default.

(cherry picked from commit 66084c7234f7cbf96d70ceb58d189535d8b14959)

setup.py

@@ -30,10 +30,10 @@ import setup_zstd
 import setup_b2
 
 # True: use the shared liblz4 (>= 1.7.0 / r129) from the system, False: use the bundled lz4 code
-prefer_system_liblz4 = False
+prefer_system_liblz4 = True
 
 # True: use the shared libzstd (>= 1.3.0) from the system, False: use the bundled zstd code
-prefer_system_libzstd = False
+prefer_system_libzstd = True
 
 # True: use the shared libb2 from the system, False: use the bundled blake2 code
 prefer_system_libb2 = True