Changes to liblwgeom/lwinline.h don't trigger a rebuild

[Algunenano]

If you modify anything in liblwgeom/lwinline.h and rebuild the project nothing will be recompiled.

I guess the solution is to add it to SA_HEADERS

[komzpa]

There is completely alternative way of solving this: compile all the liblwgeom as single compiler call, without building a bunch of .o files and then linking them. May require a rework of build system but is potentially a bigger gain.

[Algunenano]

There is completely alternative way of solving this: compile all the liblwgeom as single compiler call, without building a bunch of .o files and then linking them. May require a rework of build system but is potentially a bigger gain.

That would mean that changing a single character in a .c would force rebuilding everything and that things like ccache become useless. I'm not a fan unless you show some super big win elsewhere, and even if you did, I'd ask for an option to only enable it during release.

[Raul Marin]

In 17147:

Force liblwgeom recompilation when lwinline.h changes

Closes ​https://github.com/postgis/postgis/pull/359
Closes #4288