Add new triplets for 64-bit LoongArch

[loongson-zn]

BPO	46498
Nosy	@loongson-zn, @xen0n
PRs	gh-90656: Add platform triplets for 64-bit LoongArch (LA64) #30939
Files	loongarch64.diff loongarch64-new.diff: update loongarch64.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-01-24.05:00:22.024>
labels = ['build', '3.9']
title = 'Add new triplets for loongarch64'
updated_at = <Date 2022-01-27.08:05:30.042>
user = 'https://github.com/loongson-zn'

bugs.python.org fields:

activity = <Date 2022-01-27.08:05:30.042>
actor = 'loongson-zn'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2022-01-24.05:00:22.024>
creator = 'loongson-zn'
dependencies = []
files = ['50579', '50590']
hgrepos = []
issue_num = 46498
keywords = ['patch']
message_count = 2.0
messages = ['411701', '411842']
nosy_count = 2.0
nosy_names = ['loongson-zn', 'xen0n']
pr_nums = ['30939']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue46498'
versions = ['Python 3.9']

[xen0n]

First of all I think the changes should probably go in main branch first, then backported to the older branches if possible; although IMO you'd be much better off just backporting and carrying the patch yourselves.

Secondly the suggested patch is not consistent with the LoongArch toolchain spec, in that it didn't use the multiarch identifiers in the spec document (https://github.com/loongson/LoongArch-Documentation/blob/a8a004148734445480659a5e25ef985817881341/docs/LoongArch-toolchain-conventions-EN.adoc, Table 12), but rather the old-world one; see the discussion at loongarch64#1 (in Chinese) too.

[loongson-zn]

loongarch64.diff has been modified according to the new toolchain spec.