Automatically insert libiosexec1 depend in PACK

[asdfugil]

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Fixes #1274 This PR makes it so that when all of the following conditions are met, a libiosexec1 depend is auto-inserted into the control file.

• darwin is not in $(MEMO_TARGET)
• The package name is not libiosexec1 or libiosexec-dev
• The package contains at least one Mach-O binary