clarifications.
(Breakpoint Handling): Remove mention of BREAKPOINT macro.
(Longjmp Support): Update description to reflect how it is done
for targets without using native header.
(Symbol Handling): Add a little more general explanation.
(COFF, ELF): Mention stabs encapsulation.
(DWARF 3): New section.
(Adding a New Host): Scrub out some obsolete bits.
(Generic Host Support Files): Mention ser-pipe.c, ser-mingw.c.
(Host Conditionals): Remove descriptions of NO_STD_REGS,
HAVE_MMAP, HAVE_TERMIO, INT_MAX etc, LONGEST, HAVE_LONG_DOUBLE,
PRINTF_HAS_LONG_DOUBLE, SCANF_HAS_LONG_DOUBLE, L_SET, SEEK_CUR,
SEEK_SET, STOP_SIGNAL, USG.
(Raw and Virtual Register Representations): Ditto for
DEPRECATED_REGISTER_RAW_SIZE, DEPRECATED_REGISTER_VIRTUAL_SIZE,
DEPRECATED_REGISTER_VIRTUAL_TYPE, REGISTER_CONVERT_TO_TYPE.
(Target Conditionals): Ditto for DEPRECATED_FP_REGNUM,
DEPRECATED_FRAMELESS_FUNCTION_INVOCATION, DEPRECATED_FRAME_CHAIN,
DEPRECATED_FRAME_CHAIN_VALID, DEPRECATED_FRAME_INIT_SAVED_REGS,
DEPRECATED_FRAME_SAVED_PC, DEPRECATED_FUNCTION_START_OFFSET,
DEPRECATED_REGISTER_VIRTUAL_SIZE,
DEPRECATED_REGISTER_VIRTUAL_TYPE,
DEPRECATED_USE_STRUCT_CONVENTION.
Describe gdbarch_deprecated_fp_regnum.
Update description of gdbarch_print_insn.
(Adding a New Target): Scrub out obsolete bits.
(Obsolete Conditionals): Remove entire section.
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