Windows: fall back to old style of media handling

The new style media handling doesn't seem to work due to the naming of
the cabinet.  Simply fallback to the old schema for now.

Author: compnerd

Diff for: platforms/Windows/toolchain.wxs

@@ -3,8 +3,15 @@
   <Product Id="*" Language="1033" Manufacturer="swift.org" Name="Toolchain" UpgradeCode="9871289b-f9cb-4b39-8122-2c7ec1ab24d5" Version="$(var.ProductVersion)">
     <Package Comments="Copyright (c) 2021 Swift Open Source Project" Compressed="yes" Description="Toolchain" InstallScope="perMachine" Manufacturer="swift.org" />
 
-    <MediaTemplate CompressionLevel="high" EmbedCab="yes" />
-    <Media Id="1" Cabinet="toolchain.cab" />
+    <!--
+      NOTE(compnerd) Use high compression as this is an extrodinarily large
+      cabinet.  With upstream being amenable to considering decorations for
+      DLL builds, this might be possible to reduce in the future hopefully.
+      In the mean time, burn the CPU cycles to try to claw back the minimal
+      bit of savings to hedge against the constant complaints that the MSIs
+      are too large.
+    -->
+    <Media Id="1" Cabinet="toolchain.cab" EmbedCab="yes" CompressionLevel="high" />
 
     <?ifdef INCLUDE_DEBUG_INFO ?>
     <Media Id="2" Cabinet="clang_PDBs.cab" />