sys-libs/libselinux: add musl patch

[xmhd]

pid_t function in libselinux requires patching for musl.

Update copyright date in header of -9999 ebuild.

@perfinion

[gentoo-bot]

Pull Request assignment

Submitter: @xmhd
Areas affected: ebuilds
Packages affected: sys-libs/libselinux

sys-libs/libselinux: @gentoo/selinux

Linked bugs

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[gentoo-repo-qa-bot]

Pull request CI report

Report generated at: 2021-04-02 00:04 UTC
Newest commit scanned: b0c0c7b
Status: ✅ good

There are existing issues already. Please look into the report to make sure none of them affect the packages in question:
https://qa-reports.gentoo.org/output/gentoo-ci/373f58a888/output.html

[thesamesam]

Fixed long ago.