[committed] Fix libobjc/23108, reading and writing of structs is wrong

[Andrew Pinski <pinskia at physics dot uc dot edu>]

The problem here is that we don't get the correct size because we added 
the
rounded version of the size to the current size.  The extra add is the 
problem.
Corrected it by removing the add.

Committed to the mainline after a build and test on powerpc-darwin and
x86_64-pc-linux-gnu.

Thanks,
Andrew Pinski

libobjc/ChangeLog:
	* archive.c (objc_write_type): Correct the element offset.
	(objc_read_type): Likewise.

gcc/testsuite/ChangeLog:
	* objc.dg/type-stream-1.m: New test.

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