Radix cross Linux Toolchains

build:
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cd products && make -j32 all

make targets:
============

tree_clean      - clean whole tree including dist and sources(.makefile stamps) directories but
                  !!!NOT CLEAN downloaded sources!!!

downloads_clean - remove downloaded sources in sources directory


NOTE:
====
  Directory names in products folder shouldn't match with any toolchain name.
  For example, if we have toolchain name 'x86_64-glibc' then directory name
  for this toolchain should be at least 'X86_64-glibc'.

NOTE JZ47XX GLibc:
  The -O3 optimisation for glibc made wrong executables. We have to use -O2 only.