[master] ca236b6d5 Update vtest2: fix distcheck

[Nils Goroll]

commit ca236b6d5b6d99a3d191cace96f02d9cea452eae
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Fri Jul 4 21:07:08 2025 +0200

    Update vtest2: fix distcheck

diff --git a/bin/varnishtest/Makefile.am b/bin/varnishtest/Makefile.am
index 260044ebf..f001eb215 100644
--- a/bin/varnishtest/Makefile.am
+++ b/bin/varnishtest/Makefile.am
@@ -11,7 +11,7 @@ AM_CPPFLAGS = \
 	-I$(top_builddir)/include \
 	-I$(top_builddir) \
 	-I$(top_srcdir)/lib/libvgz \
-	-Ivtest2/lib
+	-I$(srcdir)/vtest2/lib
 
 bin_PROGRAMS =	varnishtest
 
@@ -65,6 +65,7 @@ varnishtest_SOURCES = \
 		vtest2/src/vtc_tunnel.c \
 		vtest2/src/vtc_varnish.c \
 		vtest2/src/vtc_vsm.c \
+		vtest2/lib/vudp.h \
 		vtest2/lib/vudp.c
 
 varnishtest_LDADD = \