Remove pointless #imports from .m and .h files

This was done with a brute-force approach, ensuring no additional
warnings from GCC 4.9 under x86_64.

OpenChange/MAPIStoreContactsAttachment.m

@@ -20,18 +20,12 @@
  * Boston, MA 02111-1307, USA.
  */
 
-#import <Foundation/NSCalendarDate.h>
-#import <Foundation/NSString.h>
-#import <NGExtensions/NGBase64Coding.h>
-#import <NGCards/NGVCardPhoto.h>
 
-#import "MAPIStoreTypes.h"
 #import "NSData+MAPIStore.h"
 #import "NSDate+MAPIStore.h"
 #import "NSObject+MAPIStore.h"
 #import "NSString+MAPIStore.h"
 
-#import "MAPIStoreContactsAttachment.h"
 
 #include <mapistore/mapistore_errors.h>