Reorder ecpg_config.h.in alphabetically

This makes it easier to maintain the order if we automate the
generation of this file.

Author: petere

src/interfaces/ecpg/include/ecpg_config.h.in

@@ -1,3 +1,7 @@
+/* Define to 1 to build client libraries as thread-safe code.
+ *    (--enable-thread-safety) */
+#undef ENABLE_THREAD_SAFETY
+
 /* Define to 1 if the system has the type `int64'. */
 #undef HAVE_INT64
 
@@ -12,7 +16,3 @@
 
 /* Define to 1 to use <stdbool.h> to define type bool. */
 #undef PG_USE_STDBOOL
-
-/* Define to 1 to build client libraries as thread-safe code.
- *    (--enable-thread-safety) */
-#undef ENABLE_THREAD_SAFETY