[PATCH] Enable Windows --auto-image-base to take an argument

[Nicholas Clifton]

Hi Chris,

>      2014-03-17  Christopher Faylor  <me.cygwin2013@cgf.cx>
>
>      	* ld.texinfo: Document change in handling of --enable-auto-image-base.
>      	* emultempl/pe.em (pe_auto_image_base): Set to default base.
>      	(gld_${EMULATION_NAME}_list_options): Change usage message to reflect
>      	optional --enable-auto-image-base argument.
>      	(gld${EMULATION_NAME}_handle_option): Handle optional
>      	--enable-auto-image-base argument.
>      	(compute_dll_image_base): Eliminate constant.  Use pe_auto_image_base.

Approved - please apply.

Cheers
   Nick