Build: Header-file related cleanup
2557c4cfbe66
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Description

Build: Header-file related cleanup

Move headers generated by configure to include/
Re-instate an "external" header for use by out-of-tree projects
Include all (but only) relevant defines in the external header Ie. directory locations, and user/group names/ids but not which functions, headers or libraries are installed
Do not include internal headers in external ones Doing so prevents out-of-tree builds
Do not re-define variables in Makefiles (ie. -DSOMEVAR=@SOMEVAR@) This is what config.h is for
Do not create multiple names for the same #define
Give portability.h a more appropriate name
Document the header files managed by configure and how they are created
Dont define variables that dont exist to be be other variables that also dont exist
Dont expose internal build options (like if we use alphasort for sorting)
Tweak the names of some #defines for clarity and to avoid namespace polution
Remove dead options