vbox6: add shared folder support

builds virtualbox6-sharedfolders.lib.so from unmodified VirtualBox6
sources.

fixes #4288

repos/ports/lib/mk/virtualbox6-sharedfolders.mk

@@ -0,0 +1,18 @@
+include $(REP_DIR)/lib/mk/virtualbox6-common.inc
+
+SHARED_LIB = yes
+
+SRC_CC += mappings.cpp
+SRC_CC += shflhandle.cpp
+SRC_CC += VBoxSharedFoldersSvc.cpp
+SRC_CC += vbsf.cpp
+SRC_CC += vbsfpathabs.cpp
+SRC_CC += vbsfpath.cpp
+
+LIBS += stdcxx
+
+INC_DIR += $(VBOX_DIR)/HostServices/SharedFolders
+
+CC_CXX_WARN_STRICT =
+
+vpath %.cpp $(VBOX_DIR)/HostServices/SharedFolders

repos/ports/recipes/pkg/vbox6/runtime

@@ -56,6 +56,7 @@
 					<dir name="pipe"> <pipe/> </dir>
 					<dir name="shared"> <fs label="shared" writeable="yes"/> </dir>
 					<rom name="VBoxSharedClipboard.so"/>
+					<rom name="VBoxSharedFolders.so"/>
 					<fs writeable="yes"/>
 				</vfs>
 				<libc stdout="/dev/log" stderr="/dev/log" rtc="/dev/rtc" pipe="/pipe">
@@ -79,6 +80,8 @@
 				<service name="ROM" label="platform_info">  <parent label="platform_info"/> </service>
 				<service name="ROM" label="VBoxSharedClipboard.so">
 				  <parent label="virtualbox6-sharedclipboard.lib.so"/> </service>
+				<service name="ROM" label="VBoxSharedFolders.so">
+				  <parent label="virtualbox6-sharedfolders.lib.so"/> </service>
 				<service name="Nic">                        <parent/>                       </service>
 				<service name="Report" label="shape">       <parent label="shape"/>         </service>
 				<service name="ROM"    label="clipboard">   <parent label="clipboard"/>     </service>
@@ -104,6 +107,7 @@
 		<rom label="vfs_oss.lib.so"/>
 		<rom label="vfs_pipe.lib.so"/>
 		<rom label="virtualbox6-sharedclipboard.lib.so"/>
+		<rom label="virtualbox6-sharedfolders.lib.so"/>
 	</content>
 
 </runtime>

repos/ports/src/virtualbox6/services/target.mk

@@ -1,3 +1,4 @@
 TARGET = dummy-virtualbox6-services
 
 LIBS += virtualbox6-sharedclipboard
+LIBS += virtualbox6-sharedfolders