Kernel/LibC: add SYS_STAT and stat(), lstat()

libc/CMakeLists.txt

@@ -10,6 +10,7 @@ set(LIBC_SOURCES
 	stdio.cpp
 	stdlib.cpp
 	string.cpp
+	sys/stat.cpp
 	sys/wait.cpp
 	termios.cpp
 	unistd.cpp