[pixman] Fix x86 builds not using MSVC

[Flole998]

Fixes the #Todo comment in pixman's portfile.cmale

[MonicaLiu0311]

There are two situations when modifying files under vcpkg/ports/portName:

1. If a version is released upstream, update the "version" field in vcpkg.json and count "port-version" from 0 (port-version is a field that records changes specific to vcpkg, 0 generally means deleting "port-version" line). Reference: 38214/files.
2. If the upstream has not released a new version, then after modifying other files, please accumulate the "port-version" value to record this modification. Reference: 37966/files.

Please read the documentation: maintainer guide#versioning.

[dg0yt]

I wonder if this isn't enough.

[Flole998]

Apparently the missing flag breaks the build, so I can remove the CFLAGS on my next attempt and we can see if the CI runs through.

[MonicaLiu0311]

At present, the version information of your commit is inconsistent with your local one:

##[error]Found the following errors:
##[error]versions/p-/pixman.json(2,): error : while parsing versions for pixman from version/p-/pixman.json
0.43.4 is declared with f7e1a97a6af1ad657489f901a6ca14db24652eff, but the local port has a different SHA a4e66badb15b7db89e768b1a1943583bff608b2c.

Please run ./vcpkg x-add-version testPort [--overwrite-version] before each push:

1. For any file modification under the ports/testPort/ folder, please commit after modification
2. Run ./vcpkg x-add-version portName to generate a series of version according to your commit info (Add --overwrite-version when generating other than the first time)
3. Commit verison information again
4. Push together

--overwrite-version
After the first modification, please run ./vcpkg x-add-version testPort to generate the corresponding json; for subsequent modifications of the same version, please use ./vcpkg x-add-version portName --overwrite-version to update git-tree.

maintainer guide#versioning.

[MonicaLiu0311]

Note: I will be converting your PR to draft status. When you're ready, please revert to "ready for review".

[Flole998]

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