ld/PE: adjust pe_detail_list[]

M*Core uses pe-dll.c, but has no entry in the table. Add both big and
little endian ones. Many of the entries aren't relevant when targeting
PE+; move the #endif accordingly. The MIPS entry is actually
questionable altogether: No mips*-*-* target uses pe-dll.c or pep-dll.c.

As I lack sufficient knowledge of the target, introduction of
jmp_mcore_bytes[] will need to be handled by someone else.