* NEWS: Mention new feature --exclude-modules-for-implib.

	* NEWS:  Mention new feature --exclude-modules-for-implib.
	* ld.texinfo:  Document new --exclude-modules-for-implib option.
	* pe-dll.c (exclude_list_struct):  Change type member from int to
	new enumeration exclude_type.
	(pe_dll_add_excludes):  Accept exclude_type instead of int param.
	(auto_export):  Replace magic constants by exclude_type values and
	handle new choice EXCLUDEFORIMPLIB.
	(pe_dll_generate_implib):  Accept a pointer to the link_info and
	iterate all input BFDs looking for EXCLUDEFORIMPLIB modules; re-open
	fresh BFDs for any found and link into import lib archive chain.
	* pe-dll.h (exclude_type):  Add new enumerated type to replace magic
	constants previously used for exclude_list_struct type member.
	(pe_dll_add_excludes, pe_dll_generate_implib):  Update prototypes.
	* pep-dll.h (exclude_type, pe_dll_add_excludes,
	pe_dll_generate_implib):  Likewise to all the above.
	* emultempl/pe.em (OPTION_EXCLUDE_MODULES_FOR_IMPLIB):  Define new
	getopts long option code for new --exclude-modules-for-implib option.
	(gld${EMULATION_NAME}_add_options):  Add new entry to xtra_long[].
	(gld_${EMULATION_NAME}_list_options):  List usage for it.
	(gld${EMULATION_NAME}_handle_option):  Use exclude_type enumerated
	values when calling pe_dll_add_excludes, and handle EXCLUDEFORIMPLIB.
	(gld_${EMULATION_NAME}_finish):  Pass pointer to link_info when
	calling pe_dll_generate_implib.
	* emultempl/pep.em (options):  Define new enumerated value for getopts
	long option code for new --exclude-modules-for-implib option.
	(gld${EMULATION_NAME}_add_options, gld_${EMULATION_NAME}_list_options,
	gld${EMULATION_NAME}_handle_option, gld_${EMULATION_NAME}_finish):
	Again, likewise to all the above.