Hopefully get "make distcheck" mechanics finally right

Ref b7ac17d9

src/Makefile.am

@@ -135,7 +135,9 @@ AM_VTC_LOG_FLAGS = \
 TESTS = \
 	buddy_test \
 	buddy_test_witness \
-	buddy_test_when \
+	buddy_test_when
+
+VTC_TESTS = \
 	vtc/buddy_vcl.vtc \
 	vtc/buddy_global.vtc \
 	vtc/buddy_edgecases.vtc \
@@ -152,6 +154,10 @@ TESTS = \
 	vtc/vut_slashmap.vtc \
 	vtc/loadmasters.vtc
 
+EXTRA_DIST = $(VTC_TESTS)
+
+TESTS += $(VTC_TESTS)
+
 fellow_state_tables = \
 	tbl/fco_states.h \
 	tbl/fcs_states.h \
@@ -318,9 +324,11 @@ TESTS += \
 	fellow_log_test \
 	fellow_cache_test
 
-check-am:
+check-local:
 	@mkdir -p vtc
 
+check-am: check-local
+
 # Code coverage
 
 gcov: clean
@@ -374,7 +382,7 @@ clean-local:
 	@cat $@.tmp >$@
 	@rm -f $@.tmp
 
-EXTRA_DIST = \
+EXTRA_DIST += \
 	VSC_buddy.vsc \
 	VSC_fellow.vsc