[GEOS] Generate debug library names with d suffix

[mloskot]

Applies to current port of GEOS 3.6.2
Follows discussion on Slack hannel #vcpkg

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Currently geos.lib name is used for both, debug and optimised
GEOS libraries. This leads to situation when:

find_library(GEOS_LIBRARY_DEBUG NAMES geos)
find_library(GEOS_LIBRARY_RELEASE NAMES geos)

finds the same library for both

GEOS_LIBRARY_DEBUG=D:/vcpkg/installed/x64-windows/debug/lib/geos.lib
GEOS_LIBRARY_RELEASE=D:/vcpkg/installed/x64-windows/debug/lib/geos.lib

This is minimal patch that works around the problem.

Next, complete fix should be submitted to GEOS upstream,
preferably using exported targets.

[ras0219-msft]

Thanks for the PR!

I also fixed up the references for libspatialite's static build.

[mloskot]

@ras0219-msft Thank you!

[dg0yt]

2 years later...

• This has not been upstreamed.
• Without upstream usage, it is discouraged by current guidelines (https://github.com/microsoft/vcpkg/blob/master/docs/maintainers/maintainer-guide.md#do-not-rename-binaries-outside-the-names-given-by-upstream).
• vcpkg has improved.
• The geos pc file is broken due to this change. (geos-config, too)

Now I would like to know which direction to take, starting from #17616, and aiming at fixing geos for Unix (#9068).
Is it acceptable to revert this change? I'm aware of other ports which use port geos.