Augustus: include stdint.h using the -include flag (fixes gcc-14 to 16)

[bernhardkaindl]

Fix the build of augustus with gcc-14 to 16:

• include stdint.h using the -include flag

This is a smaller version of this PR to not require a patch for the fix:

• augustus: include cstdint to comply with c++11 standard #5956 (Cc: @mikerenfro)

Alternatively, #5956 could be merged, but I wanted to fix to be tiny.

Cc: @emwjacobson (as you just made the previous fixes):
FYI, in case you build with gcc@14 or newer, this fixes it!

[sethrj]

This should be addressed with an upstream pull request and fixed via a patch directive, e.g.:

        patch(
            "https://github.com/Gaius-Augustus/Augustus/pull/NNNNNN.diff?full_index=1",
            sha256="",
            when="@:VVVV",
        )