src/extend.c: patch to clear up headerizer warnings

[James E Keenan]

Running 'make headerizer' in master earlier this evening, I got this 
message at the end of the run:

src/extend.c
     Parrot_ext_try: "void *))" isn't protected with an ARGIN, ARGOUT or 
ARGMOD (or a _NULLOK variant), or ARGFREE
     Parrot_ext_try: "PMC *" isn't protected with an ARGIN, ARGOUT or 
ARGMOD (or a _NULLOK variant), or ARGFREE
     Parrot_ext_try: "void *))" isn't protected with an ARGIN, ARGOUT or 
ARGMOD (or a _NULLOK variant), or ARGFREE
3 warnings in 1 funcs in 1 C files

The patch attached wraps these 3 instances in ARGIN_NULLOK.  Re-running 
'make headerizer' updates the corresponding header file and enables 
'make test' (see: 
http://smolder.parrot.org/app/projects/report_details/23782) and 'make 
codetest' to pass once again.

I haven't applied the patch because I can't be 100% certain that 
ARGIN_NULLOK is the correct wrapper here.  If it is, you can simply 
apply the patch (or let me know to do it).

Thank you very much.
Jim Keenan
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