"configure" enforces -U for ar flags, breaking deterministic builds.
The flag was added to fix some vaguely specified "recent POSIX binutil
build problems" in 2015. 

Upstream-Status: Pending
Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>

diff --git a/configure b/configure
index 7f31208..aa80911 100755
--- a/configure
+++ b/configure
@@ -4428,7 +4428,7 @@ if test "${cf_cv_ar_flags+set}" = set; then
 else
 
 	cf_cv_ar_flags=unknown
-	for cf_ar_flags in -curvU -curv curv -crv crv -cqv cqv -rv rv
+	for cf_ar_flags in -curv curv -crv crv -cqv cqv -rv rv
 	do
 
 		# check if $ARFLAGS already contains this choice