This OpenJDK packaging has a headless build configuration controlled by
the `minimal` flag, which is regularly build-tested by Hydra, and a
non-headless configuration based on pure Xlib libraries without Gnome
features, which is not normally tested.
Sometime before OpenJDK 8, the !enableGnome2 case broke, because it
needs to link against libXrandr but that wasn't included in the
buildInputs.
If this patch is backported to NixOS 18.03 or earlier, the same fix
needs to be applied to OpenJDK 9.
I have tested OpenJDK versions 8, 9, and 10, but not any other versions.
http://openjdk.java.net/jeps/283 "Enable GTK 3 on Linux" was included
in OpenJDK 9.
nothing else currently in nixpkgs is using 10, so this just lets us
establish a good baseline as things are ported onto it. if needed,
the build could be parameterized so that any packages that turn out to
need gtk2 could still use it.
* with only one source bundle (per JEP-296), we can use src instead of
srcs, and avoid the need to cd in prePatch
* fetch sources from jdk10u instead of jdk10, to make it easier to
grab updates when they start coming.
* removed commented-out code that became irrelevant in the 8 -> 9
transition (*.pf files, infinality font rendering)
* create jdk10, jre10, and jre10_headless attributes in
all-packages.nix
