Use user-provided CFLAGS in topology and address standardizer

[Algunenano]

Both extensions should include @CFLAGS in the PG_CPPFLAGS declaration so the flags passed during the configure step are used.

PR in ​https://github.com/postgis/postgis/pull/280 with the changes and addressing the warnings that were invisible before.

[strk]

Possible duplicate of #3037 ?

[Algunenano]

Possible duplicate of #3037 ?

The issue is similar, but in different folders.

Also similar:

• ​https://trac.osgeo.org/postgis/ticket/4060
• ​https://trac.osgeo.org/postgis/ticket/4094

[Raul Marin]

In 16673:

Use user-provided CFLAGS in the topology module

References #4140

[Raul Marin]

In 16674:

Use user provided CFLAGS in the address standardizer

Closes ​https://github.com/postgis/postgis/pull/280
Closes #4140

[Raul Marin]

In 16677:

Address standardizer warning

References #4140