* environ.c (unset_in_environ): Use strncmp instead of

* environ.c (unset_in_environ): Use strncmp instead of
DEPRECATED_STREQN.
* exec.c (exec_file_attach): Remove DEPRECATED_HPUX_TEXT_END.
* language.c (set_case_command, language_enum): Use strcmp instead
of DEPRECATED_STREQ.
* source.c (select_source_symtab): Sprinkle a few consts.  Use
strcmp instead of DEPRECATED_STREQ.