build-sys: Post-release version bump

Closes: #944
Approved by: jlebon

configure.ac

@@ -4,10 +4,10 @@ dnl update libostree-released.sym from libostree-devel.sym, and update the check
 dnl in test-symbols.sh, and also set is_release_build=yes below.  Then make
 dnl another post-release commit to bump the version, and set is_release_build=no.
 m4_define([year_version], [2017])
-m4_define([release_version], [7])
+m4_define([release_version], [8])
 m4_define([package_version], [year_version.release_version])
 AC_INIT([libostree], [package_version], [walters@verbum.org])
-is_release_build=yes
+is_release_build=no
 AC_CONFIG_HEADER([config.h])
 AC_CONFIG_MACRO_DIR([buildutil])
 AC_CONFIG_AUX_DIR([build-aux])

src/libostree/libostree-devel.sym

@@ -18,6 +18,8 @@
 ***/
 
 /* Add new symbols here.  Release commits should copy this section into -released.sym. */
+LIBOSTREE_2017.8 {
+};
 
 /* Stub section for the stable release *after* this development one; don't
  * edit this other than to update the last number.  This is just a copy/paste