rustbuild: Include rustfmt in deduplicated dependencies

Currently `rustfmt` is excluded from the "don't build dependencies
twice" check but it's currently building dependencies twice! Namely big
dependencies like `rustc-ap-syntax` are built once for rustfmt and once
for the RLS. This commit includes `rustfmt` in these checks and then
fixes the resulting feature mismatches for winapi.

src/bootstrap/tool.rs

@@ -84,6 +84,7 @@ impl Step for ToolBuild {
                 | "cargo"
                 | "clippy-driver"
                 | "miri"
+                | "rustfmt"
                 => {}
 
                 _ => return,

src/tools/rustc-workspace-hack/Cargo.toml

@@ -26,6 +26,7 @@ features = [
   "basetsd",
   "consoleapi",
   "errhandlingapi",
+  "ioapiset",
   "jobapi",
   "jobapi2",
   "knownfolders",
@@ -33,12 +34,14 @@ features = [
   "memoryapi",
   "minschannel",
   "minwinbase",
+  "namedpipeapi",
+  "ntdef",
   "ntsecapi",
   "ntstatus",
   "objbase",
-  "profileapi",
   "processenv",
   "processthreadsapi",
+  "profileapi",
   "psapi",
   "schannel",
   "securitybaseapi",
@@ -53,6 +56,10 @@ features = [
   "winbase",
   "wincon",
   "wincrypt",
+  "winsock2",
+  "ws2def",
+  "ws2ipdef",
+  "ws2tcpip",
 ]
 
 [dependencies]