Remove unused win_x86_32_mingw47* files

We only provide offline installers for MinGW 4.8 these days

Change-Id: I4e6ccc0e0cb8fd6ad5fbc6e5ebc7fe000ffc3ddb
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>
mkqt5bld: Add some log output for renaming .so files for Android

Change-Id: I19d8b5144aee11943efcbd8112b4171fbbee545c
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>