win32: pcapif: ensure we can run with npcap as well

By default, npcap keeps its DLLs not in system32 but in system32/npcap.
To load DLLs from there, mark them as "delay load DLLs" and adjust the
DLL search path before using/loading them.

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>

contrib/ports/win32/pcapif.c

@@ -1057,6 +1057,9 @@ pcapif_init(struct netif *netif)
 
   int local_index;
   SYS_ARCH_DECL_PROTECT(lev);
+
+  pcapifh_init_npcap();
+
   SYS_ARCH_PROTECT(lev);
   local_index = ethernetif_index++;
   SYS_ARCH_UNPROTECT(lev);