glib: bump zlib & meson + modernize

[SpaceIm]

• bump zlib
• bump meson (build requirements)
• cache Meson configuration
• raise ConanInvalidConfiguration in validate() instead of configure()
• reorder methods by order of execution
• test_package: enforce C, and remove useless pkgconfig stuff

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• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
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[ericLemanissierBot]

I detected other pull requests that are modifying glib/all recipe:

• fix glib compilation with msvc-clang #10029

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[conan-center-bot]

All green in build 3 (121c0c28da26c0e571eba594173a8e425c03809f):

• glib/2.66.2@:
  All packages built successfully! (All logs)

• glib/2.67.6@:
  All packages built successfully! (All logs)

• glib/2.69.3@:
  All packages built successfully! (All logs)

• glib/2.65.3@:
  All packages built successfully! (All logs)

• glib/2.71.1@:
  All packages built successfully! (All logs)

• glib/2.71.3@:
  All packages built successfully! (All logs)

• glib/2.70.4@:
  All packages built successfully! (All logs)

• glib/2.71.2@:
  All packages built successfully! (All logs)

• glib/2.68.3@:
  All packages built successfully! (All logs)

• glib/2.72.0@:
  All packages built successfully! (All logs)