Default import libraries to be compatible with the MS linker, and

Default import libraries to be compatible with the MS linker, and
create a parameter to allow the original behavior.

ld/ChangeLog:

	* pe-dll.h (pe_mslink_compatible_implib): Declare new global.
	* pep-dll.h (pep_mslink_compatible_implib): Declare new global.
	* pep-dll.c: Define to use during PE+ object build.
	* pe-dll.c (pe_mslink_compatible_implib): Define.
	  (make_head): Add new parameter to indicate whether function
	    is being called when making import library.
	    When making compatible import library, use the dll name
	    instead of unique name.
	  (make_one): Likewise.
	  (make_tail): Likewise.
	  (pe_dll_generate_implib): Indicate that an import library
	    is being generated.
	  (pe_process_import_defs): Indicate that an import library
	    is not being generated.
	* emultempl/pe.em: Add parameter --incompatible-mslink-implib
	* emultempl/pep.em: Likewise.