Fix pacman install within a parallel bundler install -jX #403
+69
−16
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pacman invocation must be serialized to avoid locking error.
Add a second gem using libidn2, so that two different libraries are requested and the test case fails if anyone isn't available after parallel pacman execution.
The test case requires bundler-2.6.x to trigger the failure due to rubygems/rubygems#8248 .
Fixes #397