superiotool: fix out-of-box NetBSD Makefile support

Add NetBSD-specific locations under pkg/ and missing linker flag
for libpciutils.

Change-Id: I812817a374aaba561b28d8a22f20d238c9dca32b
Signed-off-by: Andrey Korolyov <andrey@xdel.ru>
Reviewed-on: https://review.coreboot.org/12830
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/superiotool/superiotool.h

@@ -34,7 +34,11 @@
 #endif
 
 #ifdef PCI_SUPPORT
+# ifdef __NetBSD__
+#include <pciutils/pci.h>
+# else
 #include <pci/pci.h>
+# endif
 #endif
 
 #if defined(__FreeBSD__)