Fix build of vainfo.

Fix build of vainfo.

commit f8aebf54e0d6b2411cb495f9fab71dc8a05c245c
Author: Gwenole Beauchesne <gbeauchesne@splitted-desktop.com>
Date:   Thu Jun 25 14:06:38 2009 +0000

    Further fixes to vainfo: use strrchr() instead of rindex(), make
    profile_string() and entrypoint_string() always return a value.

commit 4e6d19d5588998b5a9da30500ce727410b5787ef
Author: Gwenole Beauchesne <gbeauchesne@splitted-desktop.com>
Date:   Wed Jun 24 12:43:55 2009 +0000

    Fix vainfo error messages.

Signed-off-by: Austin Yuan <shengquan.yuan@intel.com>