[experimental-ims] c316746 Attempt a distclean first, something gets cached otherwise.

[Geoff Simmons]

commit c316746df309e7adf720cf4a1a38889e390aa273
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Tue Jun 14 08:42:04 2011 +0000

    Attempt a distclean first, something gets cached otherwise.

diff --git a/autogen.des b/autogen.des
index a75d482..58f3c2b 100755
--- a/autogen.des
+++ b/autogen.des
@@ -4,6 +4,8 @@
 
 set -ex
 
+make -k distclean > /dev/null 2>&1 || true
+
 # Prefer CLANG if we have it, and have not given preferences
 if [ -f /usr/bin/clang -a "x${CC}" = "x" ] ; then
 	CC=clang