Restore quotes.

Author: jaraco

distutils/ccompiler.py

@@ -14,15 +14,15 @@
 from .compilers.C.errors import CompileError, LinkError
 
 __all__ = [
-    "CompileError",
-    "LinkError",
-    "_default_compilers",
-    "compiler_class",
-    "gen_lib_options",
-    "gen_preprocess_options",
-    "get_default_compiler",
-    "new_compiler",
-    "show_compilers",
+    'CompileError',
+    'LinkError',
+    '_default_compilers',
+    'compiler_class',
+    'gen_lib_options',
+    'gen_preprocess_options',
+    'get_default_compiler',
+    'new_compiler',
+    'show_compilers',
 ]