Prevent "undef var" errors on gcc --help or --version with self-specs
* gcc.c (spec_undefvar_allowed): New global. (process_command): Set to true when running for --version or --help, alone or together. (getenv_spec_function): When the variable is not defined, use the variable name as the variable value if we're allowed not to issue a fatal error. From-SVN: r232287
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