Overview of changes in Sysprof 3.21.91
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Sysprof 3.21.91 is here with a few changes as we stabilize for 3.22.

 * Allow collapsing the callgraph tree with Left arrow.
 * Add a full barrier before writing data_tail as suggested by
   Perf kernel documentation. (Ray Strode)
 * Support for additional architectures has been enabled by the use
   of C11 atomics.
 * Require -std=gnu11 for stdatomic.h
 * Correct gettext domain for translation files (Kalev Lember)

If you have fun and interesting architectures, please give them a try!