WIN32: fix calling conventions for 32-bit builds

On 32-bit Windows Intel builds the __cdecl and __stdcall calling
conventions are different so labeling the functions that are
exported or assigned to function pointers matters.

Change-Id: I03b6f34baeb9ffb2e683fd979f12f27a5078a4da

lib/hx509/print.c

@@ -93,7 +93,7 @@ Time2string(const Time *T, char **str)
  * @ingroup hx509_print
  */
 
-HX509_LIB_FUNCTION void HX509_LIB_CALL
+HX509_LIB_FUNCTION void
 hx509_print_stdout(void *ctx, const char *fmt, va_list va)
 {
     FILE *f = ctx;