Merge branch 'bc/more-git-var'

Add more "git var" for toolsmiths to learn various locations Git is
configured with either via the configuration or hardcoded defaults.

* bc/more-git-var:
  var: add config file locations
  var: add attributes files locations
  attr: expose and rename accessor functions
  var: adjust memory allocation for strings
  var: format variable structure with C99 initializers
  var: add support for listing the shell
  t: add a function to check executable bit
  var: mark unused parameters in git_var callbacks

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