ObjFW  History of src/amiga-glue.m of 5ffdf1aebc1be32e

All necessary changes to adjust for the changes made in trunk are
included in the merge commit. file: [adf8c12199] check-in: [3c88df0ce4] user: js, branch: amiga-library, size: 11603 [annotate] [blame] [check-ins using] [diff]

This is done by using functions that return a reference to the variable
and defining of_std{in,out,err} to a call into these functions. file: [0f4f4302e3] check-in: [9697334084] user: js, branch: amiga-library, size: 8714 [annotate] [blame] [check-ins using] [diff]

Also contains a workaround for Amiga library functions not being able to
return structs. file: [316cef8c1f] check-in: [1ec05804b0] user: js, branch: amiga-library, size: 8476 [annotate] [blame] [check-ins using] [diff]

This avoids needing to #undef std{in,out,err} and then providing a new
symbol. file: [c28d6d3ae5] check-in: [514944f1ea] user: js, branch: amiga-library, size: 1289 [annotate] [blame] [check-ins using] [diff]

These are based on runtime/amiga-{library,glue,end}.m. file: [96aff37bed] check-in: [f6ab72da6e] user: js, branch: amiga-library, size: 1102 [annotate] [blame] [check-ins using]