feat: Intel GPU fixes, add tcc compiler, spreadsheet improvements, paint app, file manager improvements

programs/include/libc/unistd.h

@@ -12,6 +12,7 @@ extern "C" {
 int    read(int fd, void *buf, size_t count);
 int    write(int fd, const void *buf, size_t count);
 int    close(int fd);
+long   lseek(int fd, long offset, int whence);
 
 #ifdef __cplusplus
 }