[PostGIS] #5764: PostGIS make install fails when building against meson-built PostgreSQL

[PostGIS]

#5764: PostGIS make install fails when building against meson-built PostgreSQL
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  Reporter:  robe     |      Owner:  strk
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.5.0
 Component:  install  |    Version:  master
Resolution:           |   Keywords:
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Comment (by robe):

 Yeh success, debbie's PG17 meson built just finished regressing.

 @strk wants us to get rid of having to repeat the same lines in each
 extension make file.
 I think the cleanest way is to get rid of PGXS include entirely, however
 when I did that my meson build for some reason couldn't fine pe or link
 with lpgport etc.  Might be something screwy with my build, so I'll save
 that for #5281 and close this out as soon as all bots are done regressing.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5764#comment:9>
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