[CMSSW_7_0_X][48] Updates for GCC 4.8.X 

The following provides cleanups for CNU GCC 4.8.X. Intended for bootstrapping:
- `slc6_amd64_gcc481`
- `osx107_amd64_gcc481`
- `osx108_amd64_gcc481`
- `fc18_armv7hl_gcc481`

__Not a final version__, more modifications needed to bring for GCC and Intel MIC.