Minor spacing changes in etc/{group,inittab,passwd,profile}
Updated toolchain.txt to use GCC 4.9.2. Updated kernel config to 3.17.2.
Update changes.txt for kernel update.
Re-built EGLIBC (2.19).
Update libgcc to 4.9.2
Rebuilt BusyBox (1.22.1 with patches). Binary not committed yet.
Changes in this build:
1. Applied temporary patches from upstream Git master to fix important bugs.
2. Removed 'cut' and 'expr'. (Unused in scripts and "$(())" is better.)
3. Removed unnecessary features in 'ash' and 'mount', but enable 'help' builtin and fancy prompts.
4. Disable some useless config options to reduce size.