make kNewRange a static array

Change-Id: I78096e2a28e6f732e13df6bde790a1266053838c
diff --git a/src/enc/bit_writer.c b/src/enc/bit_writer.c
index c7f9031..8b67764 100644
--- a/src/enc/bit_writer.c
+++ b/src/enc/bit_writer.c
@@ -84,7 +84,7 @@
 };
 
 // range = ((range + 1) << kVP8Log2Range[range]) - 1
-const uint8_t kNewRange[128] = {
+static const uint8_t kNewRange[128] = {
   127, 127, 191, 127, 159, 191, 223, 127, 143, 159, 175, 191, 207, 223, 239,
   127, 135, 143, 151, 159, 167, 175, 183, 191, 199, 207, 215, 223, 231, 239,
   247, 127, 131, 135, 139, 143, 147, 151, 155, 159, 163, 167, 171, 175, 179,