regina: RC is the port's numeric result, RESULT its string, for ARexx ports

[jonx]

Problem

For a command sent to an ARexx port (ENVIR_AMIGA), envir.c passed retstr, the port's RESULT string, to post_process_system_call() as the value of RC. So a script that tests RC after a successful command that returns output sees a non-zero string and reads it as a failure, and RESULT is never set.

Fix

ARexx semantics: RC is the host's rm_Result1, and RESULT is its rm_Result2 string when OPTIONS RESULTS is on. For ARexx ports only, RC now gets the number and RESULT the string. Other environments keep their existing behaviour.

Testing

On hosted aarch64 AROS, with the static rexx built from these sources (the file list and defines of contrib-regina-rexx), driving a port that returns class codes in rm_Result1 and output in rm_Result2:

• success: RC = 0, RESULT = the command's output;
• eleven different refusals: RC = the exact numeric code each time;
• the same sequence driven from an AmigaDOS script gives identical codes and output.

Before the fix, every successful command with output read as a failure.

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