companion_tools/m4: Add m4 tool

Add version 1.4.13 of m4 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}"

}