Add ksysent.h and scno.h to BUILT_SOURCES

This guarantees that ksysent.h and scno.h, along with other targets
listed in BUILT_SOURCES, are made on 'make all', 'make check',
and 'make check-valgrind' before other targets are processed.

* scno.am (BUILT_SOURCES): Add scno.h.
* tests/Makefile.am (BUILT_SOURCES): Add ksysent.h.

scno.am

@@ -41,4 +41,5 @@ scno.h: $(top_srcdir)/scno.head syscallent.i
 	LC_ALL=C sed -n '$(SCNO_SED)' $(filter-out $<,$^) >> $@-t
 	mv $@-t $@
 
+BUILT_SOURCES += scno.h
 CLEANFILES += syscallent.i scno.h

tests/Makefile.am

@@ -387,6 +387,7 @@ clean-local: clean-local-check
 clean-local-check:
 	-rm -rf -- $(TESTS:.test=.dir) $(GEN_TESTS:.gen.test=.dir)
 
+BUILT_SOURCES = ksysent.h
 CLEANFILES = ksysent.h
 
 include ../scno.am