Release 1.6.1

No code changes from 1.6.0. The only difference is that the
library is no longer built with the libtool -release flag,
meaning that the major/minor API fields will no longer be
part of the SONAME (and dynlink).

Signed-off-by: Jesper Lloyd <jpl.lloyd@gmail.com>

configure.ac

@@ -9,7 +9,7 @@ AC_PREREQ(2.62)
 
 m4_define([libmypaint_api_major], [1])
 m4_define([libmypaint_api_minor], [6])
-m4_define([libmypaint_api_micro], [0])
+m4_define([libmypaint_api_micro], [1])
 m4_define([libmypaint_api_prerelease], [])  # may be blank
 
 # ABI version. Changes independently of API version.