automake: Add AM_PROG_AR before LT_INIT to silence a lot of warnings.

The warnings appear to occur with newer automake (probably 1.12).

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
diff --git a/bin/.gitignore b/bin/.gitignore
index 2ee67a6..dfaa6d3 100644
--- a/bin/.gitignore
+++ b/bin/.gitignore
@@ -5,3 +5,4 @@
 /missing
 ylwrap
 compile
+ar-lib