[PATCH 0/1] MR7961: msvcrt: Fix buffer overflow in __STRINGTOLD_L

[Yuxuan Shui (＠yshui)]

__STRINGTOLD_L expects a pointer to a `_LDOUBLE` as its first argument, which we internally declare
as `MSVCRT__LDOUBLE`. Problem is, `_LDOUBLE` is 10 bytes long, whereas `MSVCRT__LDOUBLE` is 12 bytes
long (ULONG * 3). Writing into the third ULONG is technically a buffer overflow.

Declare `MSVCRT__LDOUBLE` instead as 2 ULONGs plus a USHORT.