- remove some compiler warnings

git-svn-id: http://svn.lfbs.rwth-aachen.de/svn/scc/trunk/MetalSVM@299 315a16e6-25f9-4109-90ae-ca3045a26c18

kernel/ping.c

@@ -99,7 +99,7 @@ static u32_t ping_time;
 /* port-defined functions used for timer execution */
 //void sys_msleep(u32_t ms);
 
-static u32_t sys_now() 
+inline u32_t sys_now(void) 
 {
 	static uint64_t start = 0;
 	uint64_t end;

lwip/src/include/arch/cc.h

@@ -69,6 +69,8 @@ typedef size_t mem_ptr_t;
 #define MEM_ALIGNMENT 4
 #define ETH_PAD_SIZE  2
 
+#define LWIP_CHKSUM_ALGORITHM 2
+
 /* prototypes for printf() and abort() */
 #include <metalsvm/stdio.h>
 #include <metalsvm/stdlib.h>