[PATCH v3 0/8] MR6730: include: Add misc CRT functions declarations.

[Rémi Bernon (＠rbernon)]

Needed to build libc++.

--
  v3: include: Add math.h _(l|f)dtest function declarations.
      include: Remove non-existing _atold definition.
      include: Fix _strtod_l/strtold/_strtold_l declarations.
      include: Add some __sys_nerr declaration.
      include: Add some ___mb_cur_max_func declarations.
      include: Add some struct timespec definitions.
      include: Add some localized ctype.h function declarations.
      include: Add __pctype_func declaration.

https://gitlab.winehq.org/wine/wine/-/merge_requests/6730