main: make --verison and --help options work even if a broken .ctags is given

[masatake]

Here "broken" means .ctags redefines an existing language with --langdef option like --langdef=C.

Close #2935.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (9b421f1) 83.01% compared to head (30c420a) 83.02%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3756   +/-   ##
=======================================
  Coverage   83.01%   83.02%           
=======================================
  Files         227      227           
  Lines       55128    55134    +6     
=======================================
+ Hits        45766    45773    +7     
+ Misses       9362     9361    -1     

Impacted Files	Coverage Δ
main/options.c	83.98% <100.00%> (+0.11%)	:arrow_up:

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