community/polyml: add loongarch64 support

Patch backported from:https://github.com/polyml/polyml/pull/190

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• 8d23e278...0f07ed59 - 6 commits from branch alpine:master
• 1e091d6a - community/polyml: add loongarch64 support

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assigned to @nmeum

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• 1e091d6a...2794967a - 83 commits from branch alpine:master
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added arch:loongarch64 label

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• e6734277...408922f9 - 428 commits from branch alpine:master
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Patch seems to have been upstream https://github.com/polyml/polyml/pull/190

Hi, in this link https://github.com/polyml/polyml/pull/190/files, config.h.in is indeed not modified, but in the latest upstream code https://github.com/polyml/polyml/blob/master/config.h.in file adds support for loongarch64 architecture

resolved all threads

added 1931 commits

• 948d1e26...1d925f8e - 1930 commits from branch alpine:master
• d2137dd8 - community/polyml: add loongarch64 support

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added 2 commits

• 7ac7dc17 - 1 commit from branch alpine:master
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merged