Remove BN_LONG macro.

It's never used, upstream or downstream. The 64-bit value is wrong anyway for
LLP64 platforms.

Change-Id: I56afc51f4c17ed3f1c30959b574034f181b5b0c7
Reviewed-on: https://boringssl-review.googlesource.com/2123
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/bn/internal.h b/crypto/bn/internal.h
index 88ab547..ab09c6e 100644
--- a/crypto/bn/internal.h
+++ b/crypto/bn/internal.h
@@ -138,7 +138,6 @@
 #if defined(OPENSSL_64_BIT)
 
 #define BN_ULLONG	unsigned long long
-#define BN_LONG		long
 #define BN_BITS		128
 #define BN_BYTES	8
 #define BN_BITS4	32
@@ -158,7 +157,6 @@
 
 #define BN_ULLONG	unsigned long long
 #define BN_MASK	(0xffffffffffffffffLL)
-#define BN_LONG		int32_t
 #define BN_BITS		64
 #define BN_BYTES	4
 #define BN_BITS4	16