nfctool: Fix builds on 32-bit ARM with __USE_TIME64_REDIRECTS

tv_sec and tv_usec might be long or long long, depending on
__USE_TIME64_REDIRECTS.  32-bit ARM Debian builds apparently defined it
as long long, so they failed:

tools/nfctool/llcp-decode.c: In function 'llcp_print_pdu':
tools/nfctool/llcp-decode.c:553:41: error: format '%ld' expects argument of type 'long int', but argument 4 has type '__time64_t' {aka 'long long int'} [-Werror=format=]
  553 |                 sprintf(time_str,  "%c%ld.%06lds", prefix, msg_timestamp.tv_sec,
      |                                       ~~^                  ~~~~~~~~~~~~~~~~~~~~
      |                                         |                               |
      |                                         long int                        __time64_t {aka long long int}
      |                                       %lld
tools/nfctool/llcp-decode.c:553:47: error: format '%ld' expects argument of type 'long int', but argument 5 has type '__suseconds64_t' {aka 'long long int'} [-Werror=format=]
  553 |                 sprintf(time_str,  "%c%ld.%06lds", prefix, msg_timestamp.tv_sec,
      |                                           ~~~~^
      |                                               |
      |                                               long int
      |                                           %06lld
  554 |                                                         msg_timestamp.tv_usec);
      |                                                         ~~~~~~~~~~~~~~~~~~~~~
      |                                                                      |
      |                                                                      __suseconds64_t {aka long long int}

Let's just cast this to long long, so same code will work fine for both
platforms.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Author: krzk

tools/nfctool/llcp-decode.c

@@ -550,8 +550,8 @@ int llcp_print_pdu(guint8 *data, guint32 data_len, struct timeval *timestamp)
 			prefix = '+';
 		}
 
-		sprintf(time_str,  "%c%ld.%06lds", prefix, msg_timestamp.tv_sec,
-							msg_timestamp.tv_usec);
+		sprintf(time_str,  "%c%lld.%06llds", prefix, (long long int)msg_timestamp.tv_sec,
+			(long long int)msg_timestamp.tv_usec);
 	}
 
 	llcp_printf_header(direction_str, direction_color,