Fix emulated readdir() d_type to return DT_FILE or DT_DIR like Unix does

We used to abuse dirent.d_type to store Windows attributes, but we can now just
add a new attribute to store these (win_attrs), so I have.

lib/bbackupd/BackupClientDirectoryRecord.cpp

@@ -435,13 +435,9 @@ bool BackupClientDirectoryRecord::SyncDirectoryEntry(
 #ifdef WIN32
 	// Don't stat the file just yet, to ensure that users can exclude
 	// unreadable files to suppress warnings that they are not accessible.
-	//
-	// Our emulated readdir() abuses en->d_type, which would normally
-	// contain DT_REG, DT_DIR, etc, but we only use it here and prefer to
-	// have the full file attributes.
 
 	int type;
-	if (en->d_type & FILE_ATTRIBUTE_DIRECTORY)
+	if (en->d_type == DT_DIR)
 	{
 		type = S_IFDIR;
 	}
@@ -514,24 +510,24 @@ bool BackupClientDirectoryRecord::SyncDirectoryEntry(
 			return false;
 		}
 
-		#ifdef WIN32
+#ifdef WIN32
 		// exclude reparse points, as Application Data points to the
 		// parent directory under Vista and later, and causes an
 		// infinite loop:
 		// http://social.msdn.microsoft.com/forums/en-US/windowscompatibility/thread/05d14368-25dd-41c8-bdba-5590bf762a68/
-		if (en->d_type & FILE_ATTRIBUTE_REPARSE_POINT)
+		if (en->win_attrs & FILE_ATTRIBUTE_REPARSE_POINT)
 		{
 			rNotifier.NotifyMountPointSkipped(this, realFileName);
 			return false;
 		}
-		#endif
+#endif // WIN32
 	}
 	else // not a file or directory, what is it?
 	{
 		if (type == S_IFSOCK
 #ifndef WIN32
 			|| type == S_IFIFO
-#endif
+#endif // !WIN32
 			)
 		{
 			// removed notification for these types

lib/win32/emu.cpp

@@ -1141,7 +1141,15 @@ struct dirent *readdir(DIR *dp)
 					NULL, NULL);
 				//den->d_name = (char *)dp->info.name;
 				den->d_name = &tempbuff[0];
-				den->d_type = dp->info.dwFileAttributes;
+				den->win_attrs = dp->info.dwFileAttributes;
+				if(dp->info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+				{
+					den->d_type = DT_DIR;
+				}
+				else
+				{
+					den->d_type = DT_REG;
+				}
 			}
 			else // FindNextFileW failed
 			{

lib/win32/emu.h

@@ -213,10 +213,22 @@ inline int strncasecmp(const char *s1, const char *s2, size_t count)
 #error You must not include the MinGW dirent.h!
 #endif
 
+// File types for struct dirent.d_type. Not all are supported by our emulated readdir():
+#define DT_UNKNOWN       0
+#define DT_FIFO          1
+#define DT_CHR           2
+#define DT_DIR           4
+#define DT_BLK           6
+#define DT_REG           8
+#define DT_LNK          10
+#define DT_SOCK         12
+#define DT_WHT          14
+
 struct dirent
 {
 	char *d_name;
-	DWORD d_type; // file attributes
+	int d_type; // emulated UNIX file attributes
+	DWORD win_attrs; // WIN32_FIND_DATA.dwFileAttributes
 };
 
 struct DIR