Not possible to run msp430 apps

[jck]

There are various problems with the msp430 apps right now:

• msp430 Makefiles include ../plat/msp430.mk. This relative path does not work when accept changes to the sandbox directory.
• msp430-activityrec 's Makefile attempts to include the non existent directory $(ACCEPTDIR)/rt/msp430/perfctr. Perhaps accept-apps/plat/msp430rt needs to be moved to accept/rt/msp430?
• Making rt/acceptrt.msp430.bc fails (after moving plat/msp430rt to rt/msp430) since __accept_roi_result, perfctr_lo, perfctr_hi are undefined indentifiers.

[sampsyo]

Thanks for pointing these out! It looks like some things got out of sync when we spun off the accept-apps repository from the main accept one. I'll look into some fixes.