[master] 8f4e7d452 build: Migrate witness.sh execution to vmod/ directory

[Dridi Boukelmoune]

commit 8f4e7d4521ba84d501d7863469260eed330f4f4c
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Mon Mar 6 07:19:44 2023 +0100

    build: Migrate witness.sh execution to vmod/ directory
    
    It's about time...

diff --git a/Makefile.am b/Makefile.am
index f9cad589d..e050e2ba8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -82,7 +82,7 @@ gcov_digest:
 witness.dot: all
 	$(MAKE) check AM_VTC_LOG_FLAGS=-pdebug=+witness
 	$(AM_V_GEN) $(srcdir)/tools/witness.sh witness.dot bin/varnishtest/ \
-		lib/libvmod_*/
+		vmod/
 
 .dot.svg:
 	$(AM_V_GEN) $(DOT) -Tsvg $< >$@