Upgrade raster tests running even if postgis raster is disabled

[robe]

Cirrus builds are failing on master

​https://cirrus-ci.com/task/4631711644909568

 --------------- Extensions --------------- 
  PostgreSQL EXTENSION support:       enabled
  PostGIS Raster:                     disabled
  PostGIS Topology:                   enabled
  SFCGAL support:                     enabled
  Address Standardizer support:       enabled
/usr/local/bin/perl -lpe "s'MODULE_PATHNAME'\$libdir/postgis_sfcgal-3'g;s'@extschema@\.''g" > sfcgal_after_upgrade.sql
rm -f sfcgal_after_upgrade.sql.tmp
echo "BEGIN;" > sfcgal_upgrade.sql
cat sfcgal_before_upgrade.sql sfcgal_upgrade.sql.in sfcgal_after_upgrade.sql >> sfcgal_upgrade.sql
echo "COMMIT;" >> sfcgal_upgrade.sql
gmake[1]: Leaving directory '/tmp/cirrus-ci-build/sfcgal'
---- Making all in utils
gmake[1]: Entering directory '/tmp/cirrus-ci-build/utils'
sed -e '1,/^__END__/d' postgis_restore.pl.in \
	| sort -u \
	> postgis_restore_data.hardcoded
gmake[1]: *** No rule to make target '../raster/rt_pg/rtpostgis_upgrade.sql', needed by 'postgis_restore_data.generated'.  Stop.
gmake[1]: Leaving directory '/tmp/cirrus-ci-build/utils'
gmake: *** [GNUmakefile:27: all] Error 1

I think it might have something to do with the fact that they don't have raster enabled, so they shouldn't even be trying to build raster extension or upgrades scripts.

[robe]

The commit where this started was [907a7bb4b/git]

[robe]

See #5656 a real user being inconvenienced by this bug.

[Regina Obe <lr@…>]

In 8619e4d/git:

Make sure rtpostgis_ugprade.sql gets built
during upgrade tests
Even if raster is disabled
Closes #5652