Since the setting DCMAKE_SKIP_BUILD_RPATH was disabled, we can now run
the checkPhase of cmake derivations without having to tweak the
LD_LIBRARY_PATH anymore.
> The IGRAPH_ENABLE_LTO build option now supports the AUTO value, which
> uses LTO only if the compiler supports it. Warning: CMake may not
> always be able to detect that LTO is not fully supported. Therefore,
> the default setting is OFF.
https://igraph.org/2021/03/23/igraph-0.9.1-c.html
continuation of #109595
pkgconfig was aliased in 2018, however, it remained in
all-packages.nix due to its wide usage. This cleans
up the remaining references to pkgs.pkgsconfig and
moves the entry to aliases.nix.
python3Packages.pkgconfig remained unchanged because
it's the canonical name of the upstream package
on pypi.
Refs #90840.
The check phase is now enabled. All tests pass on my machine.
I realized while doing this bump that igraph vendors OpenBLAS, ARPACK,
and GLPK. We can use our versions instead, and igraph builds
successfully, but 34 tests fail. I'm choosing correctness instead of
build times.
