globally lock the portrange when trying to grab a port to prep for multithreading

Change-Id: I78ae737b829bb428372f34db7d5bc601b5088b78
diff --git a/configure.ac b/configure.ac
index 192c012..b996e87 100644
--- a/configure.ac
+++ b/configure.ac
@@ -57,6 +57,9 @@
 PKG_CHECK_MODULES(LIBOSMOABIS, libosmoabis >= 1.1.0)
 PKG_CHECK_MODULES(LIBOSMOTRAU, libosmotrau >= 1.1.0)
 
+CFLAGS="$CFLAGS -pthread"
+LDFLAGS="$LDFLAGS -pthread"
+
 AC_ARG_ENABLE(sanitize,
 	[AS_HELP_STRING(
 		[--enable-sanitize],