Bump MODULE_VERSION to 5.2.1

Change-Id: Iee51360e6a253cb5037acc888c5569a247f33cc1
Reviewed-by: Matti Paaso <matti.paaso@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Fix compiler warning.

./qmacpasteboardmime.h:57:10: warning: private field 'type' is not used [-Wunused-private-field]
    char type;
         ^

Change-Id: I69cfd93de446cd78d32c2d346b8cb1cb1b0acd93
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>
Merge remote-tracking branch 'origin/release' into stable

Change-Id: Iecbe3b7f6f6d75e615155c4103e0fa269ca6d3d2