apply fix from Karl Eichwalder for script path Daniel

* Makefile.am: apply fix from Karl Eichwalder for script path
Daniel
diff --git a/Makefile.am b/Makefile.am
index 2e2e445..db37aeb 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -677,7 +677,7 @@
 
 $(srcdir)/dba100000.xml: dbgenattr.pl
 	@echo "## generating dba100000.xml"
-	@(dbgenattr.pl 100000 > $(srcdir)/dba100000.xml)
+	@($(top_srcdir)/dbgenattr.pl 100000 > $(srcdir)/dba100000.xml)
 
 Timingtests: xmllint$(EXEEXT) $(srcdir)/dba100000.xml
 	@echo "## Timing tests to try to detect performance"