Bug#1077582: mpgrafic: please add support for loong64

[wuruilong]

Source: mpgrafic
Version: 0.3.19-1
Followup-For: Bug #1077582
X-Debbugs-Cc: wuruil...@loongson.cn

Dear Maintainer,

Now that mpgrafic can be compiled successfully on the loongarch platform, 
please close the bug.

wuruilong