bfd/pe*.c including bfd/coff*.c

bfd/pe*.c including bfd/coff*.c

The model of a coff-<arch>.c file providing older COFF support, with a
pe-<arch>.c file defining some macros then including the coff-<arch>.c
file to provide PE support has been followed by a number of
architectures.

Some of them have PE specific code in their coff-<arch>.c files,
unconditionally compiled.  ie. they are not for old COFF support, and
there was no reason to follow the model.  They now get an error if
they are compiled stand-alone rather than being included from
pe-<arch>.c or pei-<arch>.c.

	* coff-aarch64.c (COFF_WITH_peAArch64): Don't define here.
	(COFF_WITH_PE): Error if not defined.
	* coff-ia64.c (COFF_WITH_PE): Error if not defined.
	* coff-loongarch64.c (COFF_WITH_peLoongArch64): Don't define here.
	(COFF_WITH_PE): Error if not defined.
	* coff-mcore.c (COFF_WITH_PE): Error if not defined.
	* coff-riscv64.c (COFF_WITH_PE): Error if not defined.
	* pei-aarch64.c: Remove duplicate includes.
	* pei-loongarch64.c: Likewise.
	* pei-riscv64.c: Likewise.
	* pei-x86_64.c: Likewise.