Create a list ''as a string'' from a collection of strings, passed in by `argc`/`argv`. This used to be the internals of [list] prior to the introduction of the [Tcl_Obj] API.

    :   `char *'''Tcl_Merge'''(int ''argc'', const char *const *'''argv''')`

[http://www.tcl.tk/man/tcl8.6/TclLib/SplitList.htm%|%Manual page] (8.6, but the API has been effectively static for decades).

If you're using this, ''seriously'' consider using [Tcl_NewListObj] instead.

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