makepkg.conf: Increase _FORTIFY_SOURCE level to 3

This is the relevant change for RFC 0017-increase-fortification-level that was merged 4 months ago.

Fedora and OpenSUSE also switched to level 3 in 2023.

Relevant TODO list: https://archlinux.org/todo/prepare-packages-for-d_fortify_source3/

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changed milestone to %v1.1.0

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requested review from @anthraxx

Are the few remaining items on the todo list special exceptions that can't be "fixed" quickly with the proposed cflags workaround? It'd be great to get this in.

changed milestone to %v1.1.1

mentioned in merge request !229 (merged)

mentioned in merge request archlinux/packaging/packages/pacman!6 (merged)

assigned to @gromit

changed milestone to %v1.2.0

added 71 commits

• 885dc609...6d0ac6b9 - 70 commits from branch archlinux:master
• c79a9931 - feat(makepkg.conf): Increase _FORTIFY_SOURCE level to 3

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mentioned in commit archlinux/packaging/packages/pacman@5bac5b15

mentioned in merge request archlinux/packaging/packages/pacman!8 (closed)

mentioned in commit archlinux/packaging/packages/pacman@37a1c4b1

mentioned in commit freso/cef-minimal-obs-bin@6f7f7992

mentioned in commit tytan652/cef-minimal-obs-bin@58dd392d

mentioned in commit tytan652/cef-minimal-obs-rc-bin@5271dfb3

mentioned in issue archlinux/packaging/packages/sslh#2 (closed)