Replace wild_match with faster version and modify its interface.

Replace wild_match with faster version and modify its interface.

This new version of wild_match is comparable in speed to strcmp_iw, and has
the same signature and same return value for equal names.

gdb/ChangeLog:
    * ada-lang.c (wild_match): Reimplement.
    Change API to eliminate unused length argument, reverse arguments and
    make 0 the 'true' return value.
    (advance_wild_match): New auxiliary function for wild_match to improve
    readability.
    (ada_match_name, ada_add_block_symbols): Use new API for wild_match.
    * psymtab.c (ada_lookup_partial_symbol, map_ada_symtabs): Use new
    API for wild_match.
    * symfile.h (map_ada_symtabs): Modify declaration to use new API for
    wild_match.
    * dwarf2read.c (dw2_map_ada_symtabs): Ditto.