add gitignores for Blackfin pieces

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/include/.gitignore b/include/.gitignore
index ab7d4c7..03a533c 100644
--- a/include/.gitignore
+++ b/include/.gitignore
@@ -1,5 +1,6 @@
 /autoconf.mk*
 /asm
+/asm-blackfin/arch
 /asm-ppc/arch
 /bmp_logo.h
 /config.h