Prepare for merging into build script
Link to Scrt1.o is also required when bootstraping
Use clear if it exists to clear the screen sys fs is of type sysfs
Unmount in correct order use path as arg
Use GITURL not GITBASE
Create a .distrotech_build file in the /root dir of archroots
Build dialog early
Use libpath not mlibpath for syncing glibc bootstrap