remove #warning from sha3module.c
diff --git a/Modules/_sha3/sha3module.c b/Modules/_sha3/sha3module.c
index 2ce207d..1fdc9b7 100644
--- a/Modules/_sha3/sha3module.c
+++ b/Modules/_sha3/sha3module.c
@@ -110,7 +110,6 @@
   typedef PY_UINT64_T UINT64;
 #else
   /* 32 or 64bit platforms without unsigned int64 */
-  #warning no uint64_t available, force Keccak opt32 with interleave tables
   #define KeccakImplementation 32
   #define Unrolling 2
   #define UseSchedule 3