sys/mman.h: add MREMAP_DONTUNMAP from linux v5.7
[musl] / include / uchar.h
2018-07-18 Szabolcs Nagyuchar.h: define char16_t and char32_t for old c++
2014-10-14 Rich Felkerimplement uchar.h (C11 UTF-16/32 conversion) interfaces