[HPPA] Attach linker created dynamic sections to stub bfd

[HPPA] Attach linker created dynamic sections to stub bfd

bfd/
	* elf32-hppa.c (elf32_hppa_init_stub_bfd): New function.
	(elf32_hppa_check_relocs): Don't set dynobj.
	(elf32_hppa_size_stubs): Test !SEC_LINKER_CREATED for stub sections.
	(elf32_hppa_build_stubs): Likewise.
	* elf32-hppa.h (elf32_hppa_init_stub_bfd): Declare.
ld/
	* emultempl/hppaelf.em (hppaelf_create_output_section_statements):
	Call elf32_hppa_init_stub_bfd.