v3.1.3.1-audacity

• Fix for 64 bits Windows compatilbility
• Fix for MinGW compilation

v3.1.3 with fixes, related to Audacity

Avoid infinite recursion between wxStockGDI and wxSystemSettions

There was a possible recursion from wxStockGDI::GetFont to
wxSystemSettings::GetFont and back, resolve by using direct font
creation, adding fixed system font.