[librsvg] Use tar-ustar in AM_INIT_AUTOMAKE to remove filename length limitations

[Federico Mena Quintero <federico src gnome org>]

commit 6f67ef613c72c5b1b9fa34bcdfd0a754ab1955d0
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Feb 8 10:18:49 2018 -0600

    Use tar-ustar in AM_INIT_AUTOMAKE to remove filename length limitations
    
    With the crates update, some generated filenames in "cargo vendor" are
    longer than the 99-character limit from tar-v7.

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index d54e0fa..0d8528c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -11,7 +11,7 @@ AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_SRCDIR([rsvg.h])
 AC_CONFIG_MACRO_DIR([m4])
 
-AM_INIT_AUTOMAKE([1.9 foreign no-dist-gzip dist-xz])
+AM_INIT_AUTOMAKE([1.9 foreign no-dist-gzip dist-xz tar-ustar])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 AM_MAINTAINER_MODE([enable])