[librsvg] configure.ac: Remove rsvg_extra_version - we never used it

[Federico Mena Quintero <federico src gnome org>]

commit 28189a0cbe0df4a47d6e422430d96a5759e7a896
Author: Federico Mena Quintero <federico gnome org>
Date:   Fri Dec 28 12:07:08 2018 -0600

    configure.ac: Remove rsvg_extra_version - we never used it

 configure.ac | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index bf29a7c5..8b1aa0f8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,8 +1,7 @@
 m4_define([rsvg_major_version],[2])
 m4_define([rsvg_minor_version],[45])
 m4_define([rsvg_micro_version],[2])
-m4_define([rsvg_extra_version],[])
-m4_define([rsvg_version],[rsvg_major_version.rsvg_minor_version.rsvg_micro_version()rsvg_extra_version])
+m4_define([rsvg_version],[rsvg_major_version.rsvg_minor_version.rsvg_micro_version])
 m4_define([rsvg_lt_version_info],m4_eval(rsvg_major_version + 
rsvg_minor_version):rsvg_micro_version:rsvg_minor_version)
 
 AC_INIT([RSVG],[rsvg_version],[https://gitlab.gnome.org/GNOME/librsvg/issues],[librsvg])