virtualbox-ose: fix dkms module build

fixes #11931

srcpkgs/virtualbox-ose/patches/013-Makefile.patch

@@ -0,0 +1,44 @@
+diff --git a/src/VBox/HostDrivers/linux/Makefile b/src/VBox/HostDrivers/linux/Makefile
+index 18466b48..7c7de4e5 100644
+--- src/VBox/HostDrivers/linux/Makefile
++++ src/VBox/HostDrivers/linux/Makefile
+@@ -23,25 +23,25 @@
+ # terms and conditions of either the GPL or the CDDL or both.
+ #
+ 
+-ifneq ($(KERNELRELEASE),)
++ifneq ($(KBUILD_EXTMOD),)
+ 
+-# Building from kBuild (make -C <kernel_directory> M=`pwd`),
+-# or inside a kernel source tree.
++# Building from kBuild (make -C <kernel_directory> M=`pwd`).
++# KBUILD_EXTMOD is set to $(M) in this case.
+ 
+ obj-m = vboxdrv/
+-ifneq ($(wildcard $(CURDIR)/vboxnetflt/Makefile),)
++ifneq ($(wildcard $(KBUILD_EXTMOD)/vboxnetflt/Makefile),)
+  obj-m += vboxnetflt/
+ endif
+-ifneq ($(wildcard $(CURDIR)/vboxnetadp/Makefile),)
++ifneq ($(wildcard $(KBUILD_EXTMOD)/vboxnetadp/Makefile),)
+  obj-m += vboxnetadp/
+ endif
+-ifneq ($(wildcard $(CURDIR)/vboxpci/Makefile),)
++ifneq ($(wildcard $(KBUILD_EXTMOD)/vboxpci/Makefile),)
+  obj-m += vboxpci/
+ endif
+ 
+-else # ! KERNELRELEASE
++else # ! KBUILD_EXTMOD
+ 
+-# convenience Makefile without KERNELRELEASE
++# convenience Makefile without KBUILD_EXTMOD
+ 
+ KBUILD_VERBOSE ?=
+ KERN_VER ?= $(shell uname -r)
+@@ -146,4 +146,4 @@ load: unload
+ 		fi; \
+ 	done
+ 
+-endif # ! KERNELRELEASE
++endif # ! KBUILD_EXTMOD

srcpkgs/virtualbox-ose/template

@@ -1,7 +1,7 @@
 # Template file for 'virtualbox-ose'
 pkgname=virtualbox-ose
 version=6.0.8
-revision=1
+revision=2
 wrksrc="VirtualBox-${version%*a}"
 short_desc="General-purpose full virtualizer for x86 hardware"
 maintainer="Juan RP <xtraeme@voidlinux.org>"