WARNING WARNING WARNING
The rules to create the UTF-8 mode GDE object files do what is desired, but I
don't think that I did them correctly.
Additionally, we need some way to query the installed ICU version on the
deployment host and get the value into CMAKE. Normally, we use:
icu-config --version | cut -d"." -f -2
To get the UTF-8 GDE object files I set gtm_icu_version to 4.8 prior to running
CMAKE. While this works, it's not friendly to anyone.