Use PG_MODULE_MAGIC_EXT where available, closes #196

Author: pramsey

META.json

@@ -2,7 +2,7 @@
    "name": "http",
    "abstract": "HTTP client for PostgreSQL",
    "description": "HTTP allows you to get the content of a web page in a SQL function call.",
-   "version": "1.7.0",
+   "version": "1.7.1",
    "maintainer": [
       "Paul Ramsey <pramsey@cleverelephant.ca>"
    ],
@@ -23,7 +23,7 @@
      "http": {
        "file": "http--1.7.sql",
        "docfile": "README.md",
-       "version": "1.7.0",
+       "version": "1.7.1",
        "abstract": "HTTP client for PostgreSQL"
      }
    },

http.c

@@ -89,7 +89,14 @@
 #include <curl/curl.h>
 
 /* Set up PgSQL */
+#ifdef PG_MODULE_MAGIC_EXT
+PG_MODULE_MAGIC_EXT(
+	.name = "http",
+	.version = HTTP_VERSION
+);
+#else
 PG_MODULE_MAGIC;
+#endif
 
 /* HTTP request methods we support */
 typedef enum {