Fixing issue created by new mingw compiler.

[rlmuolo]

Fixes:
src/libcollectdclient/network_parse.c: In function 'network_parse':

src/libcollectdclient/network_parse.c:537:13: error: format '%u' expects argument of type 'unsigned int', but argument 3 has type 'size_t' {aka 'long long unsigned int'} [-Werror=format=]

537 | DEBUG("lcc_network_parse(): invalid 'sz' field: sz = %" PRIu16

  |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

538 | ", b->len = %" PRIsz "\n",

539 | sz, b->len);

  |                 ~~~~~~

  |                  |

  |                  size_t {aka long long unsigned int}

src/libcollectdclient/network_parse.c:72:27: note: in definition of macro 'DEBUG'

72 | #define DEBUG(...) printf(VA_ARGS)

  |                           ^~~~~~~~~~~

In file included from src/libcollectdclient/network_parse.c:34:

./src/daemon/globals.h:35:17: note: format string is defined here

35 | #define PRIsz "Iu"

cc1: all warnings being treated as errors

make[1]: *** [Makefile:6545: src/libcollectdclient/libcollectdclient_la-network_parse.lo] Error 1

make[1]: Leaving directory '/tmpfs/src/collectd_src'

make: *** [Makefile:4578: all] Error 2

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[igorpeshansky]

Is this the only file affected by this issue? Seems like it would apply to any use of the PRIsz format with size_t… Why not change the definition of PRIsz in globals.h? Also, this should be fixed more comprehensively by 973ffb1 (on the igorpeshansky-windows-4 branch).