companion_tools/libtool: Add libtool tool

Add version 2.2.6b of libtool as a companion tool

Signed-off-by: Richard Strand <richard.strand@icomera.com>

 # Compute IA-64-specific values

 CT_DoArchTupleValues() {

     # The architecture part of the tuple:

     CT_TARGET_ARCH="${CT_ARCH}"

 }