configure.ac: bump to version 2.99.93 for the RC1 release
diff --git a/configure.ac b/configure.ac
index bb8ae1b..61d7f37 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 m4_define([weston_major_version], [2])
 m4_define([weston_minor_version], [99])
-m4_define([weston_micro_version], [92])
+m4_define([weston_micro_version], [93])
 m4_define([weston_version],
           [weston_major_version.weston_minor_version.weston_micro_version])
 m4_define([libweston_major_version], [3])