Revert "Fix platforms that don't define UINT64_MAX."

This reverts commit b22e15c33c31d9251f64cb071de464d344d42057.

Change-Id: I39d892e67b99bec462e84aa8231f0654483669d6
Reviewed-on: https://boringssl-review.googlesource.com/16925
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/crypto/fipsmodule/cipher/e_aes.c b/crypto/fipsmodule/cipher/e_aes.c
index d349efb..ca55aa4 100644
--- a/crypto/fipsmodule/cipher/e_aes.c
+++ b/crypto/fipsmodule/cipher/e_aes.c
@@ -68,10 +68,6 @@
 #endif
 
 
-#if !defined(UINT64_MAX)
-#define UINT64_MAX 18446744073709551615ULL
-#endif
-
 OPENSSL_MSVC_PRAGMA(warning(disable: 4702)) /* Unreachable code. */
 
 typedef struct {