libgo: bump library version number for 1.7
    
    Reviewed-on: https://go-review.googlesource.com/25211

From-SVN: r238743
diff --git a/libgo/configure.ac b/libgo/configure.ac
index cda34db..e4b314e 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -11,7 +11,7 @@
 AC_CONFIG_SRCDIR(Makefile.am)
 AC_CONFIG_HEADER(config.h)
 
-libtool_VERSION=9:0:0
+libtool_VERSION=10:0:0
 AC_SUBST(libtool_VERSION)
 
 AM_ENABLE_MULTILIB(, ..)