cryptsetup: fix build with pre C11 toolchains

Add a patch removing a redefined typedef. Redefinition of typedef, even
to the same type, used to be illegal before C11.

Fixes:
http://autobuild.buildroot.net/results/93b/93b300a62f2ddbad66eab08e25fc3225969f224b/
http://autobuild.buildroot.net/results/6c6/6c6092d633400498ee5b8090733a949a9632e473/
http://autobuild.buildroot.net/results/f46/f46ef6123b5fa92753ff534b4ef7bea3f53ac388/



Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Tested-by: Hollis Blanchard <hollis_blanchard@mentor.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>