* arm-tdep.c: Include elf-bfd.h and coff/internal.h.

* arm-tdep.c: Include elf-bfd.h and coff/internal.h.
(MSYMBOL_SET_SPECIAL, MSYMBOL_IS_SPECIAL, MSYMBOL_SIZE): Move defines
to here from config/tm-arm.h.
(coff_sym_is_thumb): Make static.
(arm_elf_make_msymbol_special): New function.
(arm_coff_make_msymbol_special): New function.
* config/arm/tm-arm.h (MSYMBOL_SET_SPECIAL): Delete definition.
(MSYMBOL_IS_SPECIAL, MSYMBOL_SIZE): Likewise.
(coff_sym_is_thumb): Delete declaration.
(arm_elf_make_msymbol_special): Declare.
(arm_coff_make_msymbol_special): Declare.
(ELF_MAKE_MSYMBOL_SPECIAL): Call arm_elf_make_msymbol_special.
(COFF_MAKE_MSYMBOL_SPECIAL): Call arm_coff_make_msymbol_special.