LibTimeZone will be needed directly within LibC for functions such as
localtime(). This change adds LibTimeZone directly within LibC, so that
LibTimeZone isn't its own .so library anymore.
LibTimeZone itself is compiled as an object library to make it easier to
give it generator-specific compilation flags.
This CMakeLists.txt was basically copy-pasted from LibUnicode, where the
generated data is separated into its own library. This was to let other
libraries / applications decide if they actually want to link the data
because it is so large. LibTimeZone's generated data is significantly
smaller, so this separation really isn't needed.
The IANA Time Zone Database contains data needed, at least, for various
JavaScript objects. This adds plumbing for a parser and code generator
for this data. The generated data will be made available by LibTimeZone,
much like how UCD and CLDR data is available through LibUnicode.
