Kernel/LibC: Implement getpeername

userspace/libraries/LibC/include/sys/syscall.h

@@ -78,6 +78,7 @@ __BEGIN_DECLS
 	O(SYS_SMO_MAP,			smo_map)		\
 	O(SYS_ISATTY,			isatty)			\
 	O(SYS_GETSOCKNAME,		getsockname)	\
+	O(SYS_GETPEERNAME,		getpeername)	\
 	O(SYS_GETSOCKOPT,		getsockopt)		\
 	O(SYS_SETSOCKOPT,		setsockopt)		\
 	O(SYS_REALPATH,			realpath)		\