Fix compile on certain Linux configurations, reduce spawn point height

src/porting.h

@@ -50,6 +50,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	#define strtoull(x, y, z) _strtoui64(x, y, z)
 #else
 	#include <unistd.h>
+	#include <stdint.h> //for uintptr_t
 	
 	#define ALIGNOF(x) __alignof__(x)
 	#define sleep_ms(x) usleep(x*1000)

src/server.cpp

@@ -4879,7 +4879,7 @@ v3f findSpawnPos(ServerMap &map)
 			continue;
 		}
 
-		nodepos = v3s16(nodepos2d.X, groundheight+1, nodepos2d.Y);
+		nodepos = v3s16(nodepos2d.X, groundheight-2, nodepos2d.Y);
 		bool is_good = false;
 		s32 air_count = 0;
 		for(s32 i=0; i<10; i++){