* Fixed va_args for the z80

* Fixed va_args for the z80
* Fixed a long standing parameter bug in the mul/div/mod support function call
generating code.
* Fixed device library generation for z80 and gbz80
* Fixed printf for the z80
* Added a --no-reg-params flag which currently does nothing
* Added support to mangle support function names based on the calling
convention (reentrant, calle/caller, reg params)
* Mangled the mul/div/mod/putchar support routines to reflect mangaling
* Changed the z80 port to callee saves
* Changed the z80 port to not use reg params
* Updated support/tests/dhrystone to work again on the z80

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@1074 4a8a32a2-be11-0410-ad9d-d568d2c75423