Fix building of dist target. On my previous changes for grammar building I unintentionally removed the building of the yyacc program.

[SVN r19457]

tools/build

@@ -1 +1 @@
-Subproject commit 6b00064ae34dec7999ec2b2fd1f1e01b9e9d4744
+Subproject commit 96f5fdbd21877caa768934944b3518d1205c1cc1