BuildSystem: Move all userpace libraries under the userspace directory

As the number of libraries is increasing, root directory starts to
expand. This adds better organization for libraries

userspace/libraries/LibC/sys/stat.cpp

@@ -0,0 +1,35 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+int chmod(const char* path, mode_t mode)
+{
+	return syscall(SYS_CHMOD, path, mode);
+}
+
+int fstat(int fildes, struct stat* buf)
+{
+	return syscall(SYS_FSTAT, fildes, buf);
+}
+
+int fstatat(int fd, const char* __restrict path, struct stat* __restrict buf, int flag)
+{
+	return syscall(SYS_FSTATAT, fd, path, buf, flag);
+}
+
+int lstat(const char* __restrict path, struct stat* __restrict buf)
+{
+	return syscall(SYS_STAT, path, buf, AT_SYMLINK_NOFOLLOW);
+}
+
+int stat(const char* __restrict path, struct stat* __restrict buf)
+{
+	return syscall(SYS_STAT, path, buf, 0);
+}
+
+int mkdir(const char* path, mode_t mode)
+{
+	return syscall(SYS_CREATE_DIR, path, mode);
+}