Incorrect geometry bbox returned from ST_Simplify

[Algunenano]

Same as #4493. The bbox isn't being updated properly here either.

Example:

# WITH geom AS
(
    SELECT ST_Simplify('POLYGON((0 0, 10 0, 10 10, 10.6 10, 10.5 10.5, 10 10, 0 10, 0 0))', 1) as g
)
Select ST_AsText(g) as geometry, postgis_getbbox(g) AS box from geom;
                geometry                |              box               
----------------------------------------+--------------------------------
 POLYGON((0 0,10 0,10.5 10.5,0 10,0 0)) | BOX(0 0,10.6000003814697 10.5)
(1 row)

[Algunenano]

PR in ​https://github.com/postgis/postgis/pull/470

[Raul Marin]

In 17786:

Fix ST_Simplify output having an outdated bbox

References #4494

[Raul Marin]

In 17787:

Fix ST_Simplify output having an outdated bbox

References #4494

[Raul Marin]

In 17788:

Fix ST_Simplify output having an outdated bbox

References #4494

[Raul Marin]

In 17789:

Fix ST_Simplify output having an outdated bbox

Closes #4494
Closes ​https://github.com/postgis/postgis/pull/470

[Algunenano]

2.3 and 2.4 don't have lwgeom_refresh_bbox, so the patch breaks the build

[Raul Marin]

In 17791:

Fix bbox refresh

The function used was introduced in 2.5, so the direct
backport broke the build

Closes #4494