* scripttempl/pe.sc: Specify the output arch, which Ian says is
the Right Thing to do.
* emultempl/pe.em: various changes to parameterize the
target-specific information.
(gld_i386pe_after_open): Detect and fix MS import libraries
by renaming the member objects (which are all named the same).
* pe-dll.c: various changes to parameterize the target-specific
information.
(generate_reloc): support relocs more generically to allow for
expansion.
(pe_exe_build_sections): new; used to add .relocs to .exes
(pe_exe_fill_sections): ditto
