Makefile format and cleanup

[artemgavrilov]

Description

Remove redundant stuff and add a little bit of formatting.

Links

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.96%. Comparing base (1b6b7cb) to head (186bee6).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #633      +/-   ##
==========================================
+ Coverage   85.81%   85.96%   +0.14%     
==========================================
  Files           3        3              
  Lines        1354     1354              
  Branches      218      218              
==========================================
+ Hits         1162     1164       +2     
+ Misses         91       90       -1     
+ Partials      101      100       -1     

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[AndersAstrand]

I think that, when we rework how we build pg_stat_monitor we should also remove all notions of pg_stat_monitor being a submodule of the main postgresql repository.

[artemgavrilov]

@AndersAstrand Some other third party extensions use this approach and even in Issues we have and ask about adding EXTRA_INSTALL option that make sense only for contrib way of build. Do we want to abandon that and go only with PGSX?

[AndersAstrand]

@AndersAstrand Some other third party extensions use this approach and even in Issues we have and ask about adding EXTRA_INSTALL option that make sense only for contrib way of build. Do we want to abandon that and go only with PGSX?

I'd say definitely yes, but maybe we need to have a discussion in the team. For pg_tde we abandoned the submodule stuff and I think we should do it for everything.

[artemgavrilov]

After discussion within team we decided to drop contrib way of building extension and support only PGXS.