As CLDR 35/Unicode 12 update in rS364245 did not really do anything
other than updating the tools, revert the Makefile back to CLDR 34/
Unicode 11 just so that we have consistent build with updated tools in
preparation to no longer generating sources for legacy locales.
While here, force C sorting order when writing out Makefiles so it
does not flap depending on developer locale -- it already did several
times, and I am to blame, having C.UTF-8 on one system and en_US.UTF-8
on the other.
This mystically removes some of UTF-8 map contents, and those are indeed
not in generated UTF-8.cm, probably the source for 34 release was re-rolled.