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[PATCH 0 of 2] Fix several compiler warnings.



These are minor cleanups to fix a few compiler warnings.

Two will remain:
- one about mktemp() (but I haven't investigated if the workaround is
  portable; mktemp is used as input for mkdir, so it's safe in spite of
  the warning)

- another about a longish copyright string literal in main.c that
  exceeds the minimum required compiler-supported size.