[librsvg] Fix obsolete comment in configure.ac

[Federico Mena Quintero <federico src gnome org>]

commit 74e5d52cc5f136adb1108fb29b2691a1dd6b6ff2
Author: Federico Mena Quintero <federico gnome org>
Date:   Wed Feb 3 11:21:32 2021 -0600

    Fix obsolete comment in configure.ac

 configure.ac | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 3cec5c52..0c84a34e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,8 +1,7 @@
-
 # Package version, the "human readable" version
 m4_define([rsvg_major_version],[2])
 m4_define([rsvg_minor_version],[51])
-m4_define([rsvg_micro_version],[0]) # Keep this in sync with librsvg_crate/Cargo.toml
+m4_define([rsvg_micro_version],[0]) # Keep this in sync with Cargo.toml
 m4_define([rsvg_version],[rsvg_major_version.rsvg_minor_version.rsvg_micro_version])
 
 # Library version information.  To make a release: