configure: change the tarball name to comply with naming convention

Compilation scripts on different distributions (i.e. arch, gentoo) rely
on the tarball name to use hyphens between words.

This patch will create tarballs with hyphenated names

TEST="make dist, should produce libva-utils.tar.*"

Fixes #21

Signed-off-by: Daniel Charles <daniel.charles@intel.com>

Author: chivakker

configure.ac

@@ -53,7 +53,7 @@ AC_PREREQ(2.57)
 AC_INIT([libva_utils],
         [libva_utils_version],
         [https://github.com/01org/libva-utils/issues/new],
-        [libva_utils],
+        [libva-utils],
         [https://github.com/01org/libva-utils])
 AC_CONFIG_SRCDIR([Makefile.am])
 AC_CONFIG_MACRO_DIR([m4])