Added buildfix for Linux 5.15

Added buildfix for Linux 5.15

core/rtw_br_ext.c

@@ -17,7 +17,10 @@
 #ifdef __KERNEL__
 	#include <linux/if_arp.h>
 	#include <net/ip.h>
+	#include <linux/version.h>
+	#if (LINUX_VERSION_CODE <= KERNEL_VERSION(5, 14, 0))
 	#include <net/ipx.h>
+	#endif
 	#include <linux/atalk.h>
 	#include <linux/udp.h>
 	#include <linux/if_pppox.h>
@@ -169,6 +172,7 @@ static __inline__ void __nat25_generate_ipv4_network_addr(unsigned char *network
 }
 
 
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(5, 14, 0))
 static __inline__ void __nat25_generate_ipx_network_addr_with_node(unsigned char *networkAddr,
 		unsigned int *ipxNetAddr, unsigned char *ipxNodeAddr)
 {
@@ -200,6 +204,7 @@ static __inline__ void __nat25_generate_apple_network_addr(unsigned char *networ
 	memcpy(networkAddr + 1, (unsigned char *)network, 2);
 	networkAddr[3] = *node;
 }
+#endif
 
 
 static __inline__ void __nat25_generate_pppoe_network_addr(unsigned char *networkAddr,
@@ -889,6 +894,7 @@ int nat25_db_handle(_adapter *priv, struct sk_buff *skb, int method)
 		}
 	}
 
+#if (LINUX_VERSION_CODE <= KERNEL_VERSION(5, 14, 0))
 	/*---------------------------------------------------*/
 	/*         Handle IPX and Apple Talk frame          */
 	/*---------------------------------------------------*/
@@ -1109,6 +1115,7 @@ int nat25_db_handle(_adapter *priv, struct sk_buff *skb, int method)
 
 		return -1;
 	}
+#endif
 
 	/*---------------------------------------------------*/
 	/*                Handle PPPoE frame                */