linux: guard G_APPLICATION_DEFAULT_FLAGS behind GLib ≥ 2.74, fallba…

[DeckerSU]

…ck to G_APPLICATION_FLAGS_NONE

• Use GLIB_CHECK_VERSION(2,74,0) to select G_APPLICATION_DEFAULT_FLAGS when available, otherwise use G_APPLICATION_FLAGS_NONE.
• Resolves build failures with older GLib headers while keeping the preferred constant on newer systems.
• No functional changes; improves cross-distro compatibility.

Solve: #3063 (comment)

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[github-actions]

Visit the preview URL for this PR (updated for commit 0b75976):

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[CharlVS]

@DeckerSU can you please confirm that there are no regressions for preventing the zombie instances on Linux?

[DeckerSU]

@DeckerSU can you please confirm that there are no regressions for preventing the zombie instances on Linux?

The Linux platform is fine for now. I only found a bug on macOS - #3063 (comment).

[takenagain]

Confirmed that build works and that opening multiple windows is blocked on Ubuntu 24.04.3 LTS when building with .docker/build.sh (Ubuntu 22.04) and manually with Flutter CLI.