Use C99-style flexible array members if available.
This avoids some subtle aliasing issues, which typically aren't a problem with GCC but may be a problem elsewhere. * lib-src/ebrowse.c (struct member, struct alias, struct sym): Use FLEXIBLE_ARRAY_MEMBER. (add_sym, add_member, make_namespace, register_namespace_alias): Use offsetof (struct, flex_array_member), not sizeof (struct), as that ports better to pre-C99 non-GCC. * src/alloc.c (sdata): New typedef, replacing the old struct sdata. It is a struct if GC_CHECK_STRING_BYTES, a union otherwise. In either case, it uses a flexible array member rather than the old struct hack. All uses changed. (SDATA_NBYTES, sweep_strings) [!GC_CHECK_STRING_BYTES]: Adjust to sdata reorganization. * src/alloc.c (VBLOCK_BYTES_MIN, allocate_vectorlike, Fgarbage_collect): Use offsetof (struct, flex_array_member), not sizeof (struct), as that ports better to pre-C99 non-GCC. * src/chartab.c (Fmake_char_table, make_sub_char_table, copy_char_table): Use CHAR_TABLE_STANDARD_SLOTS rather than its definition, as the latter has changed. * src/conf_post.h (FLEXIBLE_ARRAY_MEMBER): Move here from w32.c, and port better to pre-C99 GCC. * src/image.c (struct xpm_cached_color): * src/lisp.h (struct Lisp_Vector, struct Lisp_Bool_Vector) (struct Lisp_Char_Table, struct Lisp_Sub_Char_Table): Use FLEXIBLE_ARRAY_MEMBER. * src/lisp.h (string_bytes) [GC_CHECK_STRING_BYTES]: Move decl to top level so it gets checked against implementation. (CHAR_TABLE_STANDARD_SLOTS): Adjust to struct Lisp_Char_Table change. * src/w32.c (FLEXIBLE_ARRAY_MEMBER): Move to conf_post.h.
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