Draft: Try to fix build on mips64el
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Add patch to avoid error-prone ELF header parsing, fixing build on mips64el Helps: #1042980 
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d/rules: Increate arbitrary test timeouts The default test timeout is 30 seconds, but the perf-* tests take more like 45 seconds on mips64el. Helps: #1042980 
/cc @syq
This isn't fully working yet. The tests are still failing for me on eller, with:
GNOME Shell-Message: 11:41:00.189: Registering session with GDM
(EE) failed to write to Xwayland fd: Broken pipePlease could you investigate further? It would also be useful to know whether this gnome-shell version works or crashes on real mips hardware (build with DEB_BUILD_OPTIONS=nocheck if necessary).