[bug #68192] [long-term] check all dynamic ("heap") memory allocations for success

Follow-up Comment #10, bug #68192 (group groff):


commit ad85cbebff0ec4f754120a10c1519046cf6f2758                          
Author: G. Branden Robinson <[email protected]>               
Date:   Sun May 31 21:26:06 2026 -0500                                   
                                                                         
    [grohtml]: Refactor. (2/2)                                           
                                                                         
    Be more fastidious with heap-allocated memory.

    * src/devices/grohtml/output.cpp: Use ISO C++98 exceptions to handle
      heap storage allocation failures.  Preprocessor-include C++ "<new>"
      header file.

      (word::word): Slightly refactor.  Introduce new local variable
      `amount` to track the count of `char`s we wish to allocate, so that we
      can use it both in a `new` allocation and in the fatal diagnostic
      thrown if that allocation fails.

      (word::word)
      (word_list::add_word): Catch `std::bad_alloc` exception and `fatal()`
      out with an attempt to describe what we were doing.

    Continues the long process of fixing Savannah #68192.




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