Bug#1059962: mozc： Please add loong64 binary output for Loongarch

[wuruilong]

Source: mozc
Version: 2.28.4715.102+dfsg-2.3
Followup-For: Bug #1059962
X-Debbugs-Cc: wuruil...@loongson.cn

Dear Maintainer,

I verified that the above patch compiles successfully on the loongarch 
platform, please merge the attached patch.

wuruilong