Merge branch 'LCG_81b_aarch64' into 'arm_tests_81b'

Lcg 81b aarch64

Merge request for 81b aarch64 build to sft/lcgcmake arm_tests branch.
Main changes:
updating config.guess scripts before building package. 
heptools-81b.cmake toolchain has Aarch64 catches.
Various adjustments to CMakeLists.txt files, shouldn't interfere if not Aarch64.
Some patches introduced: GPerftools, mysql (maybe some others?)
Building qt4.8.6 instead of 4.8.4
Skipping over gridexternals


See merge request !33