Backport get-win32-tarballs configure changes

configure.ac

@@ -347,7 +347,7 @@ set_up_tarballs() {
     else
         action="download"
     fi
-    mk/get-win32-tarballs.sh $action $HostArch > missing-win32-tarballs
+    $PYTHON mk/get-win32-tarballs.py $action $mingw_arch > missing-win32-tarballs
     case $? in
         0)
            rm missing-win32-tarballs
@@ -359,7 +359,7 @@ set_up_tarballs() {
            echo
            echo "  * run configure with the --enable-tarballs-autodownload option"
            echo
-           echo "  * run mk/get-win32-tarballs.sh download ${HostArch}"
+           echo "  * run mk/get-win32-tarballs.py download $mingw_arch"
            echo
            echo "  * manually download the files listed in ./missing-win32-tarballs and place"
            echo "    them in the ghc-tarballs directory."

mk/get-win32-tarballs.py

@@ -8,7 +8,6 @@ import argparse
 
 TARBALL_VERSION = '0.1'
 BASE_URL = "https://downloads.haskell.org/ghc/mingw/{}".format(TARBALL_VERSION)
-BASE_URL = "http://home.smart-cactus.org/~ben/ghc/mingw/{}".format(TARBALL_VERSION)
 DEST = Path('ghc-tarballs/mingw-w64')
 ARCHS = ['i686', 'x86_64', 'sources']