upgrade of glibc from 2.3.6 to 2.17

[fvdw]

Tests are running to upgrade glibc in the firmware to version 2.17 (currently it uses an already old version 2.3.6)

A newer glibc version will enable us to use recent software that needs new features of libc.
However it can also cause problems with already present binaries in the firmware based on libc 2.3.6
A recompile could be required to resolve incompatibility issues. But some code was designed for the old glibc and could give problems when compiling it against the new glibc. Although the documentation mentions backward compatibility, meaning binaries compiled with 2.3.6 should run with 2.17...we will see