Fix MinGW bootstrap build by applying the fix in appveyor.yml permanently.

appveyor.yml

@@ -28,7 +28,6 @@ for:
     build_script:
       ps: "C:\\msys64\\usr\\bin\\bash -lc @\"\n
       pacman -S --quiet --noconfirm --needed re2c 2>&1\n
-      sed -i 's|cmd /c `$ar cqs `$out.tmp `$in \\&\\& move /Y `$out.tmp `$out|`$ar crs `$out `$in|g' configure.py\n
       ./configure.py --bootstrap --platform mingw 2>&1\n
       ./ninja all\n
       ./ninja_test 2>&1\n

configure.py

@@ -437,7 +437,7 @@ if host.is_msvc():
            description='LIB $out')
 elif host.is_mingw():
     n.rule('ar',
-           command='cmd /c $ar cqs $out.tmp $in && move /Y $out.tmp $out',
+           command='$ar crs $out $in',
            description='AR $out')
 else:
     n.rule('ar',