Use %zd instead of %d for variables of type ssize_t

To generate correct 64-bit code (with -m64)

Change-Id: I7cd5e0c7e8bdcb9ea3bf73df0dcda55f1cb56eec

libs/host/CopyFile.c

@@ -137,7 +137,7 @@ static int copyFileContents(const char* dst, int dstFd, const char* src, int src
                 return -1;
             }
             if (writeCount != readCount) {
-                fprintf(stderr, "acp: partial write to '%s' (%d of %d)\n",
+                fprintf(stderr, "acp: partial write to '%s' (%zd of %zd)\n",
                     dst, writeCount, readCount);
                 return -1;
             }