scripts/addToolVersion.sh: add a function to extract fields from versions

This patch adds a function to extract major, minor, revision, etc. from version
numbers.

Signed-off-by: "Benoît THÉBAUDEAU" <benoit.thebaudeau@advansee.com>

 # Compute M68k-specific values

 CT_DoArchTupleValues() {

     :

 }