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Print an intX_t by casting to int64_t

The internal intX_t is either int32_t or int64_t depending on
platform bitness. Since there is no existing printf format for
such an integer, cast it to an int64_t and use the right
printf format for that instead.

This avoids warnings when building with clang.

--- a/codec/decoder/core/src/decode_slice.cpp

+++ b/codec/decoder/core/src/decode_slice.cpp

@@ -415,8 +415,8 @@

     }

     if (iUsedBits > pBs->iBits) { //When BS incomplete, as long as find it, SHOULD stop decoding to avoid mosaic or crash.

       WelsLog (pCtx, WELS_LOG_WARNING,

-               "WelsDecodeSlice()::::pBs incomplete, iUsedBits:%d > pBs->iBits:%d, MUST stop decoding.\n",

-               iUsedBits, pBs->iBits);

+               "WelsDecodeSlice()::::pBs incomplete, iUsedBits:%"PRId64" > pBs->iBits:%d, MUST stop decoding.\n",

+               (int64_t) iUsedBits, pBs->iBits);

       return -1;

     }

     iMbX = iNextMbXyIndex % pCurLayer->iMbWidth;