Rollup merge of rust-lang#114930 - ChrisDenton:label-os, r=cuviper

Automatically add OS labels to std PRs

I'd love to have `library/std/src/sys` PRs that touch Windows stuff to have the `O-windows` label for easier discovery (and rediscovery). While I'm here I added a couple of other auto OS labels. Perhaps `O-unix` is a little too broad but it's hard to be more specific and I think it's still useful insomuch as POSIX is a thing.

r? libs

triagebot.toml

@@ -177,6 +177,98 @@ exclude_labels = [
     "T-*",
 ]
 
+[autolabel."O-android"]
+trigger_files = [
+    "library/std/src/os/android"
+]
+
+[autolabel."O-fuchsia"]
+trigger_files = [
+    "library/std/src/os/fuchsia"
+]
+
+[autolabel."O-hermit"]
+trigger_files = [
+    "library/std/src/sys/hermit",
+    "library/std/src/os/hermit"
+]
+
+[autolabel."O-ios"]
+trigger_files = [
+    "library/std/src/os/ios"
+]
+
+[autolabel."O-itron"]
+trigger_files = [
+    "library/std/src/sys/itron"
+]
+
+[autolabel."O-linux"]
+trigger_files = [
+    "library/std/src/os/linux"
+]
+
+[autolabel."O-macos"]
+trigger_files = [
+    "library/std/src/os/macos"
+]
+
+[autolabel."O-netbsd"]
+trigger_files = [
+    "library/std/src/os/netbsd"
+]
+
+[autolabel."O-redox"]
+trigger_files = [
+    "library/std/src/os/redox"
+]
+
+[autolabel."O-SGX"]
+trigger_files = [
+    "library/std/src/sys/sgx",
+    "library/std/src/os/fortanix_sgx"
+]
+
+[autolabel."O-solaris"]
+trigger_files = [
+    "library/std/src/os/solaris"
+]
+
+[autolabel."O-solid"]
+trigger_files = [
+    "library/std/src/sys/solid",
+    "library/std/src/os/solid"
+]
+
+[autolabel."O-unix"]
+trigger_files = [
+    "library/std/src/sys/unix",
+    "library/std/src/os/unix"
+]
+
+[autolabel."O-wasi"]
+trigger_files = [
+    "library/std/src/sys/wasi",
+    "library/std/src/os/wasi"
+]
+
+[autolabel."O-wasm"]
+trigger_files = [
+    "library/std/src/sys/wasm",
+    "library/std/src/os/wasm"
+]
+
+[autolabel."O-watchos"]
+trigger_files = [
+    "library/std/src/os/watchos"
+]
+
+[autolabel."O-windows"]
+trigger_files = [
+    "library/std/src/sys/windows",
+    "library/std/src/os/windows"
+]
+
 [autolabel."T-bootstrap"]
 trigger_files = [
     "x.py",