Don't embed debug info in release builds

Apparently MinGW embeds DWARF, even in .exe files.
Plus, without some futzing with Windows APIs*, I'm not going to be
getting dumps from users.

* https://docs.microsoft.com/en-us/windows/win32/api/minidumpapiset/nf-minidumpapiset-minidumpwritedump

Cargo.toml

@@ -2,9 +2,5 @@
 members = ["flt2vhs", "vhscat", "flt-mover"]
 
 [profile.dev]
-opt-level = 2 # We want optimization even for debug builds for all the hashing.
+opt-level = 3 # We want debug builds be optimized + debug to benchmark them
 incremental = true # Iterate faster
-
-[profile.release]
-debug = true
-