Add script for checking sorted order of entrypoints

The ordering isn't load-bearing.

.github/workflows/libssl.yaml

@@ -96,6 +96,8 @@ jobs:
         run: ./admin/format --all -- --check
       - name: Check C formatting
         run: make format-check
+      - name: Check ordering of build.rs entrypoints
+        run: ./admin/sort-entrypoints.py
 
   clippy:
     name: Clippy

rustls-libssl/admin/sort-entrypoints.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+
+from os import path
+import difflib
+
+entries = []
+in_entries = False
+
+location = path.join(path.dirname(__file__), '../build.rs')
+
+for line in open(location):
+    if in_entries:
+        if '];' in line:
+            in_entries = False
+            continue
+
+        entries.append(line)
+
+    if 'const ENTRYPOINTS:' in line:
+        in_entries = True
+
+assert len(entries) != 0
+sorted_entries = list(sorted(entries, key=lambda s: s.lower()))
+
+if entries != sorted_entries:
+    print('!!! ENTRYPOINTS is not sorted')
+    print(''.join(difflib.context_diff(entries, sorted_entries, fromfile='build.rs', tofile='build.rs')))
+    exit(1)