Fold in the last-minute fixes (0.4.5)

changes/bug40380

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-  o Minor bugfixes (compiler warnings):
-    - Fix an indentation problem that led to a warning from  GCC 11.1.1.
-      Fixes bug 40380; bugfix on 0.3.0.1-alpha.

changes/ticket40382

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-  o Minor features (compatibility, Linux seccomp sandbox):
-    - Add a workaround to enable the Linux sandbox to work correctly
-      on systems running Glibc 2.33.  These versions have started
-      using the fstatat() system call, which previously our sandbox did not
-      allow.
-      Closes ticket 40382; see the ticket for a discussion of tradeoffs.