Make: Prepend path to dependency info files with sed

The old way was error prone due to it's use of a fixed path file and confusing.

closes #775

buildtest passed - needs testing.

Tested on:
- [x] msba2
- [ ] wsn430-v1_3b
- [x] msb-430h
- [x] chronos
- [x] msb-430
- [ ] pttu
- [ ] mbed_lpc1768
- [x] native
- [ ] telosb
- [x] redbee-econotag
- [ ] wsn430-v1_4
- [ ] avsextrem