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[LLDB] Remove a now redundant windows specific workaround

Description

[LLDB] Remove a now redundant windows specific workaround

vsnprintf(NULL, 0, ...) works for measuring the needed string
size on all supported Windows variants; it's supported since
at least MSVC 2015 (and LLVM requires a newer version than that),
and works on both msvcrt.dll (since at least XP) and UCRT with MinGW.

The previous use of ifdefs was wrong as well, as MINGW64 only is
defined for 64 bit targets, and the define without trailing
underscores is never defined automatically (neither by clang nor
by gcc).

Differential Revision: https://reviews.llvm.org/D67861