libgo: bump major version

The current version is the same as for the previous GCC release,
but there have been minor changes like new type descriptors that
make it impossible to run Go programs built with the previous GCC
release with the current libgo.

Fixes https://gcc.gnu.org/PR108057

Change-Id: I4e226b5d2c64e04accf859b3442b08f0207ba9be
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/456976
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
diff --git a/libgo/configure b/libgo/configure
index 61a4994..460fdad 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -2608,7 +2608,7 @@
 ac_config_headers="$ac_config_headers config.h"
 
 
-libtool_VERSION=21:0:0
+libtool_VERSION=22:0:0
 
 
 # Default to --enable-multilib
diff --git a/libgo/configure.ac b/libgo/configure.ac
index 274fcfc..09554a3 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -10,7 +10,7 @@
 AC_CONFIG_SRCDIR(Makefile.am)
 AC_CONFIG_HEADER(config.h)
 
-libtool_VERSION=21:0:0
+libtool_VERSION=22:0:0
 AC_SUBST(libtool_VERSION)
 
 AM_ENABLE_MULTILIB(, ..)