doc: stop generating defines.texi from configure

* generating defines.texi from configure means quagga.info will always have
  to be rebuilt by end-users, even from dist tarballs. Also breaks
  distcheck assumptions that info won't need to be built - which can be
  fixed with 'info-in-builddir' automake option, but that's too recent
  to rely on.
* doc/defines.texi.in: nuke
* doc/defines.texi: Add static version.
* {doc/Makefile.am,configure}: nuke autogen of above
* doc/quagga.texi: remove the 1 use of PACKAGE_STRING
diff --git a/doc/defines.texi b/doc/defines.texi
new file mode 100644
index 0000000..b7b529e
--- /dev/null
+++ b/doc/defines.texi
@@ -0,0 +1,14 @@
+@c -*- texinfo -*-
+
+@c Set variables
+@set PACKAGE_NAME Quagga
+@set PACKAGE_TARNAME quagga
+@set PACKAGE_STRING Quagga 1.2.0
+@set AUTHORS Kunihiro Ishiguro, et al.
+@set COPYRIGHT_YEAR 1999-2005
+@set COPYRIGHT_STR Copyright @copyright{} @value{COPYRIGHT_YEAR} @value{AUTHORS}
+
+@c These may vary with installation environment.
+@set INSTALL_PREFIX_ETC /etc/quagga
+@set INSTALL_PREFIX_SBIN /usr/sbin
+@set INSTALL_PREFIX_STATE /var/run/quagga