precompiled: drop x64-mingw32

This platform was only needed for Ruby 3.0 and earlier, which we've
dropped from the native gems.

Author: flavorjones

precompiled/Rakefile

@@ -12,14 +12,13 @@ cross_platforms = [
   "aarch64-linux-musl",
   "arm-linux-gnu",
   "arm-linux-musl",
-  "arm64-darwin",
-  "x64-mingw-ucrt",
-  "x64-mingw32",
   "x86-linux-gnu",
   "x86-linux-musl",
-  "x86_64-darwin",
   "x86_64-linux-gnu",
   "x86_64-linux-musl",
+  "arm64-darwin",
+  "x86_64-darwin",
+  "x64-mingw-ucrt",
 ]
 ENV["RUBY_CC_VERSION"] = cross_rubies.join(":")