unpackaged--2.5.0dev upgrade fails to find sfcgal

[strk]

See ​https://debbie.postgis.net/job/PostGIS_Regress/8271/console

Upgrading PostGIS in 'postgis_reg' using: CREATE EXTENSION postgis VERSION '2.5.0dev' FROM unpackaged
 failed (Error encountered creating EXTENSION POSTGIS_SFCGAL: /var/lib/jenkins/workspace/postgis/tmp/2_5_pg9.5w64/regress_log)
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...
WARNING:  'postgis.backend' is already set and cannot be changed until you reconnect
CONTEXT:  SQL statement "SELECT                  postgis_lib_version()"
PL/pgSQL function postgis_major_version_check() line 21 at SQL statement
WARNING:  'postgis.gdal_datapath' is already set and cannot be changed until you reconnect
CONTEXT:  SQL statement "SELECT                  postgis_raster_lib_version()"
PL/pgSQL function postgis_major_version_check() line 21 at SQL statement
WARNING:  'postgis.gdal_enabled_drivers' is already set and cannot be changed until you reconnect
CONTEXT:  SQL statement "SELECT                  postgis_raster_lib_version()"
PL/pgSQL function postgis_major_version_check() line 21 at SQL statement
WARNING:  'postgis.enable_outdb_rasters' is already set and cannot be changed until you reconnect
CONTEXT:  SQL statement "SELECT                  postgis_raster_lib_version()"
PL/pgSQL function postgis_major_version_check() line 21 at SQL statement
CREATE EXTENSION
ERROR:  extension "postgis_sfcgal" does not exist
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Makefile:303: recipe for target 'check' failed
make: *** [check] Error 1
make: Leaving directory '/var/lib/jenkins/workspace/postgis/branches/2.5/regress'
FAIL: upgrade unpackaged--2.5.0dev

[strk]

This is finally fixed with recent commits in trunk (to be 2.5.0).