Update kbuild for virtualbox to build.

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referencing PRs:
 PR: pool/kbuild!1

.gitmodules

@@ -450,6 +450,10 @@
 	path = VecCore
 	url = ../../pool/VecCore
 	branch = leap-16.0
+[submodule "virtualbox"]
+	path = virtualbox
+	url = ../../pool/virtualbox
+	branch = leap-16.0
 [submodule "VirtualGL"]
 	path = VirtualGL
 	url = ../../pool/VirtualGL

patchinfo.20260131182523692426.93181000773252/_patchinfo

@@ -0,0 +1,35 @@
+<patchinfo>
+  <packager>eroca</packager>
+  <rating>moderate</rating>
+  <category>recommended</category>
+  <summary>Recommended update for virtualbox, kbuild</summary>
+  <description>This update for virtualbox, kbuild fixes the following issues:
+
+Changes in virtualbox:
+
+- Introduce virtualbox.
+
+Changes in kbuild:
+
+- Update to snapshot 0.1.9998+svn3686
+  * header.kmk,footer-pass2-compiling-targets.kmk: Added EARLY_LIBS
+    and LATE_LIBS properties to better control the library order
+    when using templates. The libraries are collected from
+    EARLY_LIBS first, then LIBS, and LATE_LIBS last.
+  * header.kmk: Added KB_FN_LOAD_TOOL and KB_FN_LOAD_SDK for
+    explictly loading a tool or an sdk implementation.
+  * kmk: Automatically ascend if no makefile found and a goal was
+    given on the command line. This is to eliminating the need for
+    Makefile.kup-files as far as compiling individual source files
+    from an editor is concerned.
+  * header.kmk: Always zap the IFS variable so it won't confuse
+    kmk_ash.
+  * kmk/job.c: Deal with escape sequences inside double quotes when
+    we're using kmk_ash.
+  * kBuild/header.kmk: drop the .noarch suffix for
+    KBUILD_DEVTOOLS_TRG_NOARCH and KBUILD_DEVTOOLS_HST_NOARCH.
+</description>
+  <package>virtualbox</package>
+  <package>virtualbox:kmp</package>
+  <package>kbuild</package>
+</patchinfo>