Auto merge of #3230 - alexcrichton:better-download, r=alexcrichton

Download mingw from more reliable location

Use the same "mirror" the rust repo uses

Author: bors

appveyor.yml

@@ -15,15 +15,15 @@ environment:
   - TARGET: i686-pc-windows-gnu
     ARCH: x86
     BITS: 32
+    MINGW_URL: https://s3.amazonaws.com/rust-lang-ci
     MINGW_ARCHIVE: i686-4.9.2-release-win32-dwarf-rt_v4-rev4.7z
-    MINGW_URL: https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/4.9.2/threads-win32/dwarf/i686-4.9.2-release-win32-dwarf-rt_v4-rev4.7z/download
     MINGW_DIR: mingw32
 
 install:
   - IF "%MSVC%"=="" set PATH=C:\msys64\mingw%BITS%\bin;C:\msys64\usr\bin;%PATH%
-  - if defined MINGW_ARCHIVE appveyor DownloadFile "%MINGW_URL%" -FileName "%MINGW_ARCHIVE%"
-  - if defined MINGW_ARCHIVE 7z x -y "%MINGW_ARCHIVE%" > nul
-  - if defined MINGW_ARCHIVE set PATH=%CD%\%MINGW_DIR%\bin;C:\msys64\usr\bin;%PATH%
+  - if defined MINGW_URL appveyor DownloadFile %MINGW_URL%/%MINGW_ARCHIVE%
+  - if defined MINGW_URL 7z x -y %MINGW_ARCHIVE% > nul
+  - if defined MINGW_URL set PATH=%CD%\%MINGW_DIR%\bin;C:\msys64\usr\bin;%PATH%
   - python src/etc/install-deps.py
   - python src/etc/dl-snapshot.py %TARGET%
   - SET PATH=%PATH%;%cd%/rustc/bin