* .gitignore: Update.
* include/linux/x86/syscall.h: Update for M2-Planet.
* scaffold/read.c: Update for M2-Planet.
* lib/m2/brk.c: New file.
* lib/m2/fdgetc.c: New file.
* lib/m2/open.c: New file.
* lib/m2/putchar.c: New file.
* lib/m2/read.c: New file.