jtc df4bd22dd2 Rename tolower & toupper macros to _tolower and _toupper.
Standard C requires tolower to return a character that is !isupper unchanged
which was not being done with the macro.  The function version does the
right thing, so the loss of the macro is no great deal.

I didn't eliminate the macros entirely, since X/Open's XPG3 requires _tolower
and _toupper with the same semantics.  But, like isascii/toascii, they are
removed from the namespace if either ANSI_SOURCE or _POSIX_SOURCE is defined.
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