Update used MinGW-builds toolchain

Change-Id: I2bfbb25605471e4496de25ff27b00ad254449b08
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Akseli Salovaara <akseli.salovaara@digia.com>
Android: Remove MinGW from list of of required downloads

MinGW should be a dependency of the binary installer, there's no need to
download it separately in advance.

Change-Id: I9243cd4087aa626a3fa7fb227aad70478a9fae54
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
Fix list of mingw dlls to deploy

Change-Id: I4cf9a032ce7594bb0d8f3fad28a03145937b01cf
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Update list of MSVC dlls

Visual Studio 2005 is not supported anymore, Visual Studio 2008 is
only relevant for WinCE these days. Rather list the newer versions.

Change-Id: I71bb7f40abff5481c1c5cc5717df2e1b9fe9d27b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>