Kernel/LibC: Update SYS_SEEK to return new offset and implement lseek

libc/unistd.cpp

@@ -93,6 +93,11 @@ ssize_t pread(int fildes, void* buf, size_t nbyte, off_t offset)
 	return syscall(SYS_PREAD, fildes, buf, nbyte, offset);
 }
 
+off_t lseek(int fildes, off_t offset, int whence)
+{
+	return syscall(SYS_SEEK, fildes, offset, whence);
+}
+
 int dup(int fildes)
 {
 	return syscall(SYS_DUP, fildes);