FlexASIO: download ældre versioner

This is a hotfix release to address a regression in FlexASIO 1.10 that can result in hangs/freezes in some applications (most notably, Cycling 74' Max 8) that do not signal outputReady() for the last bufferSwitch() while stopping. See #235.

Significant changes
• FlexASIO now supports a new PortAudio feature: WASAPI loopback recording.
• This takes the form of new WASAPI input devices whose name end with [Loopback]. These devices make it possible to capture the output of the corresponding output device ("record what you hear"). See #150, PortAudio/portaudio#668.
• For more information, see the updated WASAPI documentation.

Minor changes
• FlexASIO will now refrain from logging if the logfile size exceeds 1 GB. See #146.
• This is to avoid accidental disk space exhaustion when forgetting to remove the logfile.
• Fix potential compatibility issues with some ASIO host applications (e.g. Audio Precision) that make ASIO calls with invalid/bogus sample rates. See #135.
• PortAudio was updated to latest master.