Bug#1148590: list of gnat archs is at least missing loong64

[Matthias Klose]

Package: src:gcc-mingw-w64
Version: 29
Tags: sid forky
The list of gnat archs is at least missing loong64. Please also check if 
others are missing.

The GCC packaging has

ada_no_cpus     := arc ia64 sh3 sh3eb sh4eb
ada_no_systems  :=