make pre-split xz conflict with new liblzma

[minrk]

ref: conda-forge/xz-feedstock#47

makes sure pre-split xz package cannot be installed with new liblzma, both of which provide liblzma.

cc @xhochy

• Used a static YAML file for the patch if possible (instructions).
• Ran pre-commit run -a and ensured all files pass the linting checks.
• Ran python show_diff.py and posted the output as part of the PR.
• Modifications won't affect packages built in the future.

diff

================================================================================
================================================================================
linux-armv7l
================================================================================
================================================================================
win-32
win-32::xz-5.2.2-0.tar.bz2
win-32::xz-5.2.3-0.tar.bz2
+  "constrains": [
+    "liblzma ==0.0.0"
+  ],
================================================================================
================================================================================
linux-ppc64le
linux-ppc64le::xz-5.2.4-h14c3975_1001.tar.bz2
linux-ppc64le::xz-5.2.4-h6eb9509_1002.tar.bz2
linux-ppc64le::xz-5.2.5-h6eb9509_0.tar.bz2
linux-ppc64le::xz-5.2.5-h6eb9509_1.tar.bz2
linux-ppc64le::xz-5.2.6-hb283c62_0.tar.bz2
+  "constrains": [
+    "liblzma ==0.0.0"
+  ],
================================================================================
================================================================================
osx-arm64
osx-arm64::xz-5.2.5-h642e427_1.tar.bz2
osx-arm64::xz-5.2.6-h57fd34a_0.tar.bz2
+  "constrains": [
+    "liblzma ==0.0.0"
+  ],
================================================================================
================================================================================
linux-aarch64
linux-aarch64::xz-5.2.4-h6dd45c4_1002.tar.bz2
linux-aarch64::xz-5.2.4-hda93590_1001.tar.bz2
linux-aarch64::xz-5.2.5-h6dd45c4_0.tar.bz2
linux-aarch64::xz-5.2.5-h6dd45c4_1.tar.bz2
linux-aarch64::xz-5.2.6-h9cdd2b7_0.tar.bz2
+  "constrains": [
+    "liblzma ==0.0.0"
+  ],
================================================================================
================================================================================
noarch
================================================================================
================================================================================
win-64
win-64::xz-5.2.2-0.tar.bz2
win-64::xz-5.2.3-0.tar.bz2
win-64::xz-5.2.4-h2fa13f4_0.tar.bz2
win-64::xz-5.2.4-h2fa13f4_1.tar.bz2
win-64::xz-5.2.4-h2fa13f4_1001.tar.bz2
win-64::xz-5.2.4-h2fa13f4_1002.tar.bz2
win-64::xz-5.2.4-h3cc03e0_0.tar.bz2
win-64::xz-5.2.4-h3cc03e0_1.tar.bz2
win-64::xz-5.2.4-h3cc03e0_1001.tar.bz2
win-64::xz-5.2.5-h2fa13f4_0.tar.bz2
win-64::xz-5.2.5-h62dcd97_1.tar.bz2
win-64::xz-5.2.6-h8d14728_0.tar.bz2
+  "constrains": [
+    "liblzma ==0.0.0"
+  ],
================================================================================
================================================================================
osx-64
osx-64::xz-5.0.5-1.tar.bz2
osx-64::xz-5.2.2-0.tar.bz2
osx-64::xz-5.2.3-0.tar.bz2
osx-64::xz-5.2.4-h0b31af3_1002.tar.bz2
osx-64::xz-5.2.4-h1de35cc_1001.tar.bz2
osx-64::xz-5.2.4-h470a237_0.tar.bz2
osx-64::xz-5.2.4-h470a237_1.tar.bz2
osx-64::xz-5.2.5-h0b31af3_0.tar.bz2
osx-64::xz-5.2.5-h0b31af3_1.tar.bz2
osx-64::xz-5.2.5-haf1e3a3_1.tar.bz2
osx-64::xz-5.2.6-h775f41a_0.tar.bz2
+  "constrains": [
+    "liblzma ==0.0.0"
+  ],
================================================================================
================================================================================
linux-64
linux-64::xz-5.0.5-1.tar.bz2
linux-64::xz-5.2.2-0.tar.bz2
linux-64::xz-5.2.3-0.tar.bz2
linux-64::xz-5.2.4-h14c3975_1001.tar.bz2
linux-64::xz-5.2.4-h470a237_0.tar.bz2
linux-64::xz-5.2.4-h470a237_1.tar.bz2
linux-64::xz-5.2.4-h516909a_1002.tar.bz2
linux-64::xz-5.2.5-h516909a_0.tar.bz2
linux-64::xz-5.2.5-h516909a_1.tar.bz2
linux-64::xz-5.2.6-h166bdaf_0.tar.bz2
+  "constrains": [
+    "liblzma ==0.0.0"
+  ],

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

[h-vetinari]

I think it'd be more proper to add a run-constraint xz ={{ version }} to liblzma, that way it is similarly uninstallable with the old packages, we don't need to patch old packages (only the new liblzma builds), and we can also make this transparent on the feedstock (which should happen before any repopatching).

[minrk]

OK, I thought this was simpler since the new liblzma builds don't need patches since the split xz builds already have the right pinning and both require similar repodata patches. But I can do that, if it's better.

[minrk]

alternative submitted as conda-forge/xz-feedstock#48 and #945