buildtype=minsize won't minimize the binary with Visual Studio

[matyalatte]

Describe the bug
When you use -Dbuildtype=minsize (or -Doptimization=s) with --backend=vs, msvc will use /O1 /Ot for optimization.
like this

C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\bin\HostX86\x64\CL.exe /c /I
         "demo@exe" /I. /I..\ /I"demo@exe" /I. /I..\ /Zi /nologo /W2 /WX- /diagnostics:column /FS /O1 /Ot /D _MBCS /Gm-
          /EHsc /MD /GS /Gy /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"demo@exe\main.c.obj" /Fd"demo@exe\vc143
         .pdb" /external:W2 /Gd /TC /FC /errorReport:queue /Gw ..\main.c

It means /Os will be overwritten by /Ot, I think?
When I added /Os to the options to overwrite /Ot, my app became smaller.

To Reproduce

meson setup builddir --backend=vs -Dbuildtype=minsize
meson compile -C builddir -v

Expected behavior
Remove /Ot from the compiler options when optimizing for size.

system parameters

• Is this a cross build or just a plain native build (for the same computer)?
  native build

• what operating system (e.g. MacOS Catalina, Windows 10, CentOS 8.0, Ubuntu 18.04, etc.)
  Windows 10

• what Python version are you using e.g. 3.8.0
  Idk, I installed meson with the released msi.

• what meson --version
  1.2.1

• what ninja --version if it's a Ninja build
  not ninja build