linux-custom: 3.12-rc7 with support for RT5372 USB
smali: update to 2.0-1 from AUR
linux-custom: update to 3.12~3.13

Cross-fingers that this very early kernel does not break.

config changes:
- re-enable lockdep (iwlwifi is flacky on the TU/e network)
- enable nf_tables (new in 3.13)
- enable announcement of USB devices (CONFIG_USB_ANNOUNCE_NEW_DEVICES)
- enable automatic git version if available (CONFIG_LOCALVERSION_AUTO)