[master] 9bf34a20a if --with-unwind, use it for distcheck too

[Guillaume Quintard]

commit 9bf34a20a7f05a277bbd9042e35aeba3de292da9
Author: Guillaume Quintard <guillaume at varnish-software.com>
Date:   Mon Oct 14 12:38:11 2019 -0700

    if --with-unwind, use it for distcheck too

diff --git a/Makefile.am b/Makefile.am
index f019082a2..add21a8ca 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -24,6 +24,10 @@ AM_DISTCHECK_CONFIGURE_FLAGS = \
     --enable-dependency-tracking \
     CFLAGS="$(EXTCFLAGS)"
 
+if WITH_UNWIND
+AM_DISTCHECK_CONFIGURE_FLAGS += --with-unwind
+endif
+
 install-data-local:
 	$(install_sh) -d -m 0755 $(DESTDIR)$(localstatedir)/varnish