Fixes for the magic number used in PDP11 AOUT binaries.
PR ld/25677
include * aout/aout64.h (N_DATADDR): Add IMAGIC case.
bfd * pdp11.c: Add implementation of --imagic option.
(adjust_o_magic): Fix objcopy --extract-symbol test.
* libaout.h (enum aout_magic): Add i_magic.
ld * emulparams/pdp11.sh (SCRIPT_NAME): Change to pdp11.
(EXTRA_EM_FILE): New, add emulation file pdp11.
* scripttempl/pdp11.sc: New, derived from aout.sc without
irrelevant input sections.
* emultempl/pdp11.em (_add_options, _handle_option)
(_list_options): New. Add options -z, --imagic for pdp11-aout.
(_before_parse): Make --omagic be default instead of --nmagic.
(_get_script): Modify special-case linker script for --imagic.
* lexsup.c (parse_args): Explictly set config.text_read_only for -n.
* ld.texi (Options): Add documentation of PDP11-specific options.
(Options): Fix unrelated typo to --no-compact-branches.
* gen-doc.texi: @set PDP11.
* testsuite/ld-pdp11/pdp11.exp: New, start pdp11 testing.
* testsuite/ld-pdp11/sections.s: New, source for options tests.
* testsuite/ld-pdp11/imagic.d: New, test --imagic format.
* testsuite/ld-pdp11/imagicz.d: New, test -z (imagic) format.
* testsuite/ld-pdp11/nmagic.d: New, test --nmagic format.
* testsuite/ld-pdp11/omagic.d: New, test --omagic format.
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