[1068] removed make rules for a currently-unused file

src/lib/datasrc/tests/testdata/Makefile.am

@@ -1,5 +1 @@
-BUILT_SOURCES = rwtest.sqlite3.copied
 CLEANFILES = *.copied
-
-rwtest.sqlite3.copied: rwtest.sqlite3
-	cp $(srcdir)/rwtest.sqlite3 $@