[tz] tzcode: please rename the "new" argument in icatalloc()

[Clive D.W. Feather]

Markus Scherer said:
> tzcode/private.h has this declaration:
> 
> char * icatalloc(char * old, const char * new);
> 
> The "new" identifier prevents it from being compiled with a C++ compiler.
> Would you mind renaming the second argument?

The code is written in C, not C++. C and C++ are different languages. [1]

Use a C compiler. (Which could be a C/C++ compiler with appropriate options
set.)

[1] This is official UK policy. I know because I helped set it.

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