sh64: Add .gitignore entry for syscalltab.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh64/lib/.gitignore b/arch/sh64/lib/.gitignore
new file mode 100644
index 0000000..3508c2c
--- /dev/null
+++ b/arch/sh64/lib/.gitignore
@@ -0,0 +1 @@
+syscalltab.h