MTP: Use fork instead of pthread

Change-Id: I95cf6f4def0c86f40c775738f0712323f0a0f146
diff --git a/partitions.hpp b/partitions.hpp
index 00f435a..4fe155e 100644
--- a/partitions.hpp
+++ b/partitions.hpp
@@ -239,7 +239,7 @@
 	TWPartition* Find_Next_Storage(string Path, string Exclude);
 	int Open_Lun_File(string Partition_Path, string Lun_File);
 	int mtpid;
-	pthread_t mtpthread;
+	pid_t mtppid;
 	bool mtp_was_enabled;
 
 private: