contrib/plugins/drcov: Fix string format

This fixes on Darwin:

  plugins/drcov.c:52:13: warning: format specifies type 'unsigned long' but the argument has type 'uint64_t' (aka 'unsigned long long') [-Wformat]
              start_code, end_code, entry, path);
              ^~~~~~~~~~
  plugins/drcov.c:52:25: warning: format specifies type 'unsigned long' but the argument has type 'uint64_t' (aka 'unsigned long long') [-Wformat]
              start_code, end_code, entry, path);
                          ^~~~~~~~
  plugins/drcov.c:52:35: warning: format specifies type 'unsigned long' but the argument has type 'uint64_t' (aka 'unsigned long long') [-Wformat]
              start_code, end_code, entry, path);
                                    ^~~~~

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230907105004.88600-3-philmd@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

contrib/plugins/drcov.c

@@ -48,7 +48,7 @@ static void printf_header(unsigned long count)
     uint64_t start_code = qemu_plugin_start_code();
     uint64_t end_code = qemu_plugin_end_code();
     uint64_t entry = qemu_plugin_entry_code();
-    fprintf(fp, "0, 0x%lx, 0x%lx, 0x%lx, %s\n",
+    fprintf(fp, "0, 0x%" PRIx64 ", 0x%" PRIx64 ", 0x%" PRIx64 ", %s\n",
             start_code, end_code, entry, path);
     fprintf(fp, "BB Table: %ld bbs\n", count);
 }