configure.ac: remove -dev in version

* configure.ac: Remove the -dev suffix from the version, some package
  systems at least do not like non-numeric strings in package versions
  (e.g., rpm, which I often use in testing Quagga).

  TODO: Work out some sensible scheme for semi-autogenerating the version
  perhaps via git describe. The --with-pkg-git-version doesn't affect the
  tarball name.
diff --git a/configure.ac b/configure.ac
index 7aaacb9..c684414 100755
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,7 @@
 ##
 AC_PREREQ(2.53)
 
-AC_INIT(Quagga, 0.99.25-dev, [https://bugzilla.quagga.net])
+AC_INIT(Quagga, 0.99.25, [https://bugzilla.quagga.net])
 CONFIG_ARGS="$*"
 AC_SUBST(CONFIG_ARGS)
 AC_CONFIG_SRCDIR(lib/zebra.h)