Added Popptr1 to save some bytes and ease parameter extraction

[IrgendwerA8]

Further savings are possible by exchange of assignments to ptr-variables like libsrc/cbm/rwcommon.s "ptr1<->ptr2" (but here you have to take care of dependent files).

[IrgendwerA8]

Just noticed that there is may an issue with "strpbrk.s" (use of X-register). This leads to the question what happened to the function anyway: The description in the "funcref.sgml" is commented, there is no prototype to include and even the fastcall convention isn't applied.
Time to fix or remove?

[polluks]

Remove? This is ANSI!
Please add to string.h:
char* __fastcall__ strpbrk (const char* s1, const char* s2);
Warning: The implementation is broken!

[IrgendwerA8]

Reverted change on "strpbrk.s". Together with documentation update, calling convention change and prototype introduction this is a nice extra story.

[oliverschmidt]

Please remove the unintentionally added TABs again.

[oliverschmidt]

Nice :-))

Together with documentation update, calling convention change and prototype introduction this is a nice extra story.

Full ACK.

[greg-king5]

typo: popptr1

[IrgendwerA8]

Sh... I have to hold back myself to mess around with foreign targets (wonder why there wasn't a build problem?).
Do you mind if I would fix this in my "Saved 6 bytes by using popptr1" pull request?

[oliverschmidt]

I have to hold back myself to mess around with foreign targets.

You might have a point here after all ;-)) ... see e949a3e