explicitly install iconv on msys

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attempt to fix c++ build error reported on Lemon, patch by LouD

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Fix missing prototype for `usbsid_available()`

In case USBSID isn't available we'll still need the prototype for the
`usbsid_available()` stub.


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Gtk3: respect event/snapshot directory in snapshot load/save dialogs

Read the "EventSnapshotDir" resource and use that to set the initial directory
of the event load and save dialogs.
Partially fixes bug #2192.


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fix first half of #2192 - output all invalid codes outside quotes as …

only override the C128's C64 kernal when the C128 model is DCR _and_ …

actually skip N bytes when the -skip/-offset option is used

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Update SDL MSYS2 instructions, replacing pacboy references with pacma…

Update MSYS2 instructions to only use pacman and remove pacboy refere…

Avoid use-after-free.

Reported by Dirk Meyer in bug 419. I made a very small change to the given
patch only.


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