Revert "Explicitly run ldconfig after "make install"."

This reverts commit 72d410561eabec2ffff3b714cf4c6bacc0b19b40.

src/Makefile.am

@@ -78,6 +78,3 @@ TESTS                   = \
                         t_uuid
 
 dist_man_MANS          = iperf3.1 libiperf.3
-
-install-exec-hook:
-	ldconfig