Older version - needed older file sys libraries to run with RTOS

Dependencies:   FATFileSystem

Dependents:   WavePlayerRTOS Portable_Surface_Transducer_Jukebox app-board-RTOS-Threads 4180_Lab3_P3_DNU ... more

Fork of SDFileSystem by mbed official

FATFileSystem.lib/shortlog/shortlog@c8f66dc765d4: not found in manifest