[meson] Update meson 0.55

[Neumann-A]

and allow only the vcpkg internal version to be found and used on all platforms.
(since system packages of meson are probably too old/outdated)

This unblocks a few follow up PRs. We should be able to crosscompile for arm-windows now.

[Neumann-A]

opend up mesonbuild/meson#7443 for the CI regressions

[MVoz]

don't really like that portable version is used python3.
can I use the version of the same nuget?

https://www.nuget.org/packages/python/3.8.3 x64

https://www.nuget.org/packages/pythonx86/3.8.3 x86

[MVoz]

--user Install to the Python user install directory for your platform. Typically ~/.local/, or %APPDATA%\Python on
Windows. (See the Python documentation for site.USER_BASE for full details.)
https://stackoverflow.com/questions/42988977/what-is-the-purpose-of-pip-install-user

#12285

[Neumann-A]

@voskrese: If it is on PATH and you forwarded your PATH to VCPKG or it is on a default search path for find_program/find_file vcpkg will not use its internal python.

[Neumann-A]

mako is required to actual build mesa in the future

[Neumann-A]

@BillyONeal: Requires VM update. (Or you tell me how I can check that python packages are actually installed without using pip ;))

[BillyONeal]

@Neumann-A Marked; can you add the provision-image.sh edit?

[Neumann-A]

@BillyONeal that is already done here 813a020

[BillyONeal]

@Neumann-A I am blind, thanks :)

[MVoz]

If it is on PATH and you forwarded your PATH to VCPKG or it is on a default search path for find_program/find_file vcpkg will not use its internal python.

obtained if PYTHON 3.5.2 and 3.7.3 are installed
will there be an error? all the USER folder is shared

[Neumann-A]

We should probably wait for 55.1 which solves the setuptools dependency. see mesonbuild/meson#7461 (comment)

[c72578]

Meson 0.55.1 has just been released.
https://github.com/mesonbuild/meson/releases/tag/0.55.1

[Neumann-A]

thx for the heads up. Currently finishing up my cmake compiler flags detection logic.