[spatialite-tools] Revise and update to 5.0.1

[dg0yt]

• What does your PR fix?

  Updates spatialite-tools to 5.0.1.
  Revises the dependencies. Uses pkgconfig to detect libraries for nmake and autotools builds.

• Which triplets are supported/not supported? Have you updated the CI baseline?

  all, no

• Does your PR follow the maintainer guide?

  yes

• If you have added/updated a port: Have you run ./vcpkg x-add-version --all and committed the result?

  yes

[dg0yt]

Needs readosm.pc for windows.

[dg0yt]

Windows:

cl shell.obj /libpath:D:/installed/x64-windows/debug/lib libexpatd.lib libxml2.lib readosm.lib spatialite.lib sqlite3.lib  /Fespatialite.exe
cl : Command line warning D9002 : ignoring unknown option '/libpath:D:/installed/x64-windows/debug/lib'
...
LINK : fatal error LNK1104: cannot open file 'libexpatd.lib'

Needs to switch to link.exe, or pass option explicitly as linker option.

Linux:

/mnt/vcpkg-ci/buildtrees/spatialite-tools/x64-linux-dbg/./../src/te-tools-5-5df5019d00.clean/shell.c:993: undefined reference to `readline'

Can't properly opt out of system lib readline, perhaps due to include chain?

[dg0yt]

In its current form this PR includes #21599, minus the added spatialite-tools:x64-windows-static-md=fail which is obsolete with all these changes.

[dg0yt]

@PhoebeHui kindly pinging for review. Blocks proj update.

[PhoebeHui]

LGTM, double checked, everything in .pc is correct.

[BillyONeal]

Thanks for the update!

[dg0yt]

Thanks a lot for merging. I hope I can now proceed with improving proj and the greatest nmake monster, gdal.