extract-{handshakes,keys}: rework for upstream kernel

Now that WireGuard has been upstreamed and the repos split, we have to
look elsewhere for these headers.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

contrib/extract-handshakes/Makefile

@@ -20,10 +20,5 @@ clean:
 
 .PHONY: clean
 else
-offset-finder-m := offset-finder.o
-oldsrc := $(src)
-src := $(src)/../../../src
-include $(src)/compat/Kbuild.include
-include $(src)/crypto/Kbuild.include
-src := $(oldsrc)
+obj-m := offset-finder.o
 endif

contrib/extract-handshakes/offset-finder.c

@@ -11,7 +11,7 @@ struct def {
 extern const struct def defs[];
 
 #ifdef __KERNEL__
-#include "../../../src/noise.h"
+#include "../drivers/net/wireguard/noise.h"
 
 const struct def defs[] = {
 	{ "LOCAL_STATIC_PRIVATE_KEY", offsetof(struct noise_static_identity, static_private), offsetof(struct noise_handshake, static_identity) },

contrib/extract-keys/Makefile

@@ -23,10 +23,5 @@ clean:
 
 .PHONY: clean
 else
-config-m := config.o
-oldsrc := $(src)
-src := $(src)/../../../src
-include $(src)/compat/Kbuild.include
-include $(src)/crypto/Kbuild.include
-src := $(oldsrc)
+obj-m := config.o
 endif

contrib/extract-keys/config.c

@@ -10,9 +10,9 @@ struct def {
 extern const struct def defs[];
 
 #ifdef __KERNEL__
-#include "../../../src/device.h"
-#include "../../../src/peer.h"
-#include "../../../src/noise.h"
+#include "../drivers/net/wireguard/device.h"
+#include "../drivers/net/wireguard/peer.h"
+#include "../drivers/net/wireguard/noise.h"
 const struct def defs[] = {
 	{ "SOCK_DEVICE_OFFSET", offsetof(struct sock, sk_user_data) },
 	{ "DEVICE_NAME_OFFSET", -ALIGN(sizeof(struct net_device), NETDEV_ALIGN) + offsetof(struct net_device, name) },