[Tinycc-devel] apple support

[Herman ten Brugge]

I recently added code to allow the apple m1 to work.

First I implemented the older apple code with position independent 
executables(pie).
After that I implemented the newer macos code.

The old code is the default.
The new code can be selected with configure option '--config-new_macho'.
I suspect that after some time the old code is not needed any more because
every one has swicthed to the new code and then the old code and this
option can be removed.

For support of apple 13.0 (Ventura) I needed to add another option 
'--config-codesign'.
This was needed because on this target executables needs to be signed.
This is done by running 'codesign -f -s - executeble' after it is created.

The code now runs fine at least on x86_64(10.6, 13.0) and arm64(12.3,13.0).