Fix more class/struct mixups.

headers/os/interface/MenuField.h

@@ -111,7 +111,7 @@ private:
 	friend class _BMCMenuBar_;
 	friend class LabelLayoutItem;
 	friend class MenuBarLayoutItem;
-	friend class LayoutData;
+	friend struct LayoutData;
 
 								BMenuField(const char* name,
 									const char* label, BMenu* menu,

headers/os/package/hpkg/PackageContentHandler.h

@@ -16,10 +16,10 @@ namespace BPackageKit {
 namespace BHPKG {
 
 
-class BPackageAttributeValue;
+struct BPackageAttributeValue;
 class BPackageEntry;
 class BPackageEntryAttribute;
-class BPackageInfoAttributeValue;
+struct BPackageInfoAttributeValue;
 
 
 class BLowLevelPackageContentHandler {

headers/os/package/hpkg/v1/PackageContentHandler.h

@@ -16,13 +16,13 @@ namespace BPackageKit {
 namespace BHPKG {
 
 
-class BPackageInfoAttributeValue;
+struct BPackageInfoAttributeValue;
 
 
 namespace V1 {
 
 
-class BPackageAttributeValue;
+struct BPackageAttributeValue;
 class BPackageEntry;
 class BPackageEntryAttribute;