drop rust in favor of c++ for test programs

Unfortunately Rust has deprecated support for the Windows we target.
Previous changes have replaced the Rust test programs with C++ versions.

Using Rust to write minimal Windows programs was kind of an uphill battle
anyway, e.g. the windows crate requires std to use DirectDraw (for COM
reasons, is my recollection) while we didn't want std; rust-analyzer hated
the use of x86 assembly; etc.

Getting the Windows programs small was its own fight (e.g. calling "new"
pulls in a bunch of STL goop) but I think overall it has been relatively
easier.

We unfortunately lose the 'zip' test. Ironically I had originally written
this in C++, then migrated it to Rust to be able to reuse a crate.  I
guess I could go back to pasting in a C++ zip implementation in the tree.

See discussion in rust-lang/rust#116344 , which
was the last issue where this point was finally forced.

Author: evmar

Cargo.toml

@@ -2,9 +2,6 @@
 resolver = "2"
 members = [
   "cli",
-  "exe/rust",
-  "exe/rust/ddraw-sys",
-  "exe/zip",
   "minibuild",
   "pe",
   "web/glue",

exe/README.md

@@ -1,12 +1,11 @@
 This directory contains some win32 executables used to test retrowin32.
 
 - callback: exe that calls a testing retrowin32 API that calls back to exe
+- cpp: various Windows test programs in C++
 - ops: dump results of x86 operations
-- rust: various Windows test programs in Rust
 - trace: Windows exe tracer using Windows debug API
 - winapi: MSVC Windows API (no C runtime)
 - zig_hello: Zig hello world
-- zip: compress/decompres a buffer (CPU-intensive)
 
 ## Symlinks