[musl] Remove the extended locale functions

The C library provides locale aware variants of several ctype.h and
string.h functions, but all these functions completely ignore the
locale setting and simply call the non-locale variant. Rather than
pretending that our C library supports locale, we should omit these
functions for now and if needed, actually implement them in the
future with the proper locale support.

Change-Id: Ibc7eeda464232340c2dc78d63331b6b02b1b7341

[musl] Remove weak aliases in src/ctype

Change-Id: I0651757cdce36be71a874288749321a3caa69be7

[magenta] Initial commit