Fix the tests to be compatible with archlinux/arm64

[kit-ty-kate]

Fixes everything except for this one, which i have no idea how to fix:

diff --git a/_build/default/tests/reftests/working-dir.test b/_build/default/tests/reftests/working-dir.out
index ae774ff60..0e82e5dd7 100644
--- a/_build/default/tests/reftests/working-dir.test
+++ b/_build/default/tests/reftests/working-dir.out
@@ -218,14 +218,14 @@ The following actions will be performed:
 <><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
 Processing  1/5: [qux.4: rsync]
 Processing  2/5: [qux.4: rsync] [ongoing: test newfile.txt]
+Processing  2/5: [qux.4: rsync] [ongoing: cat newfile.txt]
+Processing  2/5: [qux.4: rsync]
+Processing  3/5: [qux.4: rsync]
 -> retrieved qux.4  (file://${BASEDIR}/qux)
-Processing  2/5: [ongoing: test newfile.txt]
 test "-f" "newfile.txt" (CWD=${BASEDIR}/OPAM/working-dir/.opam-switch/build/ongoing.dev)
-Processing  2/5: [ongoing: cat newfile.txt]
 cat "newfile.txt" (CWD=${BASEDIR}/OPAM/working-dir/.opam-switch/build/ongoing.dev)
 - new!
 -> compiled  ongoing.dev
-Processing  3/5: [qux: test present]
 -> installed ongoing.dev
 Processing  4/5: [qux: test present]
 test "-f" "present" (CWD=${BASEDIR}/OPAM/working-dir/.opam-switch/build/qux.4)

[AltGr]

Ah yeah I've had one of these before. You can't disable parallelism between downloads and compilation tasks at the moment (these use two different pools of workers with different limits)

My workaround was just to grep the problematic lines out (stg like | "^Processing " -> "\c" ?)