FTBFS due to using abseil-cpp internal library

**Describe the bug**

Fails to build, here's the output:

```
In function ‘initTerrain’,
    inlined from ‘init3DView’ at /usr/src/debug/warzone2100/warzone2100/src/display3d.cpp:1600:18:
/usr/src/debug/warzone2100/warzone2100/src/terrain.cpp:1196:71: warning: argument 1 value ‘18446744073709551615’ exceeds maximum object size 9223372036854775807 [-Walloc-size-larger-than=]
/usr/include/c++/15.2.1/new: In function ‘init3DView’:
/usr/include/c++/15.2.1/new:140:26: note: in a call to allocation function ‘operator new []’ declared here
  140 | _GLIBCXX_NODISCARD void* operator new[](std::size_t)
      |                          ^
/usr/bin/ld: /usr/lib/libprotobuf.so: undefined reference to symbol '_ZN4absl12lts_2025081412log_internal21CheckOpMessageBuilder7ForVar2Ev'
/usr/bin/ld: /usr/lib/libabsl_log_internal_check_op.so.2508.0.0: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
```

**To Reproduce**
Steps to reproduce the behavior:
1. Download source.
3. Attempt to compile.
4. See error above.

**Expected behavior**
No failure.

**Your System:**
 - OS: Arch Linux
 - Game version: latest (4.6.0)

**Additional context**
Add any other context about the problem here.

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