mkosi: Drop IWYU

We use clang-tidy's include checker, so let's stop installing IWYU.

Author: DaanDeMeyer

mkosi/mkosi.tools.conf/mkosi.conf.d/debian-ubuntu.conf

@@ -12,7 +12,6 @@ PrepareScripts=%D/mkosi/mkosi.images/build/mkosi.conf.d/debian-ubuntu/mkosi.prep
 Packages=
         clang-tools
         gh
-        iwyu
         lcov
         mypy
         shellcheck

mkosi/mkosi.tools.conf/mkosi.conf.d/fedora.conf

@@ -5,7 +5,6 @@ Distribution=fedora
 
 [Content]
 Packages=
-        iwyu
         lcov
         gh
         ruff

mkosi/mkosi.tools.conf/mkosi.conf.d/opensuse.conf

@@ -11,7 +11,6 @@ PrepareScripts=%D/mkosi/mkosi.images/build/mkosi.conf.d/opensuse/mkosi.prepare
 Packages=
         clang-tools
         gh
-        include-what-you-use
         lcov
         mypy
         python3-ruff