gh-126433: Fix compiler warnings on 32-bit Windows

[vstinner]

• Issue: Compile warnings in "i686-pc-windows-msvc/msvc (Debug)" #126433

[vstinner]

I didn't fix these two warnings on purpose, I will fix them separately:

C:\victor\python\main\Modules_hacl\Lib_Memzero0.c(39,27): warning C4244: 'function': conversion from 'uint64_t' to 'SIZE_T', possible loss of data [C:\victor\python\main\PCbuild\pythoncore.vcxproj]
C:\victor\python\main\Modules_interpchannelsmodule.c(2096,30): warning C4244: '=': conversion from 'int64_t' to 'Py_ssize_t', possible loss of data [C:\victor\python\main\PCbuild\pythoncore.vcxproj]

[vstinner]

cc @sobolevn

[sobolevn]

Thank you!