[qt5-location] Rename vendored libs to avoid conflicts

[ras0219]

Extracted from #12199

[Neumann-A]

Use upstream patch instead: https://codereview.qt-project.org/c/qt/qtlocation/+/312221 ?
Just need to figure out which patchset applies to qt 5.15

[BillyONeal]

Is this why we've been getting those intermittent failures of qt stuff?

[JackBoosY]

@BillyONeal Part of these regressions.

[ras0219-msft]

@BillyONeal This should only affect qt5-location; this doesn't explain any other random Qt failures

[JackBoosY]

Most random qt build failures are due to parallel builds.

[markridgewell]

@ras0219-msft I think this change broke my code (specifically this commit: 208666f).

It seems that Assimp now links against the entire Irrlicht engine, rather than just IrrXML, but since Irrlicht defines WndProc, I get a linker error:

Irrlicht.lib(CIrrDeviceWin32.cpp.obj) : error LNK2005: "__int64 __cdecl WndProc(struct HWND__ *,unsigned int,unsigned __int64,__int64)" (?WndProc@@YA_JPEAUHWND__@@I_K_J@Z) already defined

It looks like Assimp doesn't require Irrlicht as a dependency, only IrrXML: https://github.com/assimp/assimp/blob/95d0443a5d8417051844ddfff9ad9a013b66abd9/cmake-modules/FindIrrXML.cmake

[JackBoosY]

cc @ras0219

[markridgewell]

Hi, I managed to work around the issue by putting my WndProc in an anonymous namespace, but I'm still not sure it's a good idea to add the whole of Irrlicht as a dependency here if it can be avoided.