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/usr/share/X11/xkb/compat/pc is in xkb-data 2.12-1.

This file is owned by root:root, with mode 0o644.

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default partial xkb_compatibility "pc" {

    // Sets the "Alt" virtual modifier.

    virtual_modifiers  Alt;

    setMods.clearLocks= True;
    interpret Alt_L+Any {
	virtualModifier= Alt;
	action = SetMods(modifiers=modMapMods);
    };

    interpret Alt_R+Any {
	virtualModifier= Alt;
	action = SetMods(modifiers=modMapMods);
    };
};