vmlinux.lds.h: drop unused __vermagic

The reference to '__vermagic' is a relict from v2.5 times. And even
there it had a very short life time, from v2.5.59 (commit 1d411b80
("Module Sanity Check") in the historic tree) to v2.5.69 (commit
67ac5b86 ("[PATCH] complete modinfo section")).

Neither current kernels nor modules contain a '__vermagic' section any
more, so get rid of it.
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jessica Yu <jeyu@kernel.org>
Signed-off-by: Jessica Yu <jeyu@kernel.org>

include/asm-generic/vmlinux.lds.h

@@ -332,7 +332,6 @@
 		__start_rodata = .;					\
 		*(.rodata) *(.rodata.*)					\
 		RO_AFTER_INIT_DATA	/* Read only after init */	\
-		KEEP(*(__vermagic))	/* Kernel version magic */	\
 		. = ALIGN(8);						\
 		__start___tracepoints_ptrs = .;				\
 		KEEP(*(__tracepoints_ptrs)) /* Tracepoints: pointer array */ \