charset Remove use of {isupper,islower,toupper,tolower}_w functions

charset Remove use of {isupper,islower,toupper,tolower}_w functions

These now call the common _m functions that consider UTF16 code points.

This removes the code which will make up a 'lame' table in memory, as
this can just as correctly be handled by running the algorithm at runtime (which is to call toupper() and tolower() on characters < 128).

When used, a top level waf build will always locate the correct table
- in the build tree or outside - due to relinking the installed
binary.

Andrew Bartlett