This fixes compilation with libc++ 23, which has removed a number
of unnecessary transitive includes in its headers.
Include <cstdlib> in StringConv.h for std::strtoll and std::strtoull.
Include <cstdlib> for the declarations of malloc/free/realloc/calloc
in Alloc.cpp. (Without this, the functions we define end up with
C++ name mangling.)
Include <stdarg.h> in IO.cpp for va_start/va_end.
It is dangerous for FEX to rely on the system CRT as calls can have side
effects that are also visible to the running application, and if patches
are applied to any CRT exports used during compilation the call checker
would trigger a reentry into the JIT to compile the patch and hence
deadlock. Only functions that FEX actively uses are implemented, with
the rest triggering an abort.
Jacek Caban