Pass the 'foreign' option to automake to enable iperf3 to build.

Upstream-Status: Inappropriate [configuration]

Signed-off-by: Chunrong Guo <b40290@freescale.com>

--- a/configure.ac	2015-10-19 02:49:30.471867352 -0500
+++ b/configure.ac	2015-10-19 02:46:36.207873572 -0500
@@ -33,7 +33,7 @@
 
 
 # Initialize the automake system
-AM_INIT_AUTOMAKE
+AM_INIT_AUTOMAKE([foreign])
 AM_MAINTAINER_MODE
 AM_CONFIG_HEADER(src/iperf_config.h)