Fix ability to build with Apache 2.2.

Author: GrahamDumpleton

docs/release-notes/version-4.9.4.rst

@@ -16,3 +16,6 @@ Bugs Fixed
   relying on the compiled in default, then when using mod_wsgi daemon mode, if a
   request body size greater than 1Gi was encountered the mod_wsgi daemon mode
   process would crash.
+
+* Fix ability to build mod_wsgi against Apache 2.2. Do note that in general only
+  recent versions of Apache 2.4 are supported

src/server/wsgi_apache.c

@@ -52,6 +52,19 @@ void wsgi_ap_close_listeners(void)
 
 /* ------------------------------------------------------------------------- */
 
+#if !AP_MODULE_MAGIC_AT_LEAST(20101106,1)
+
+apr_status_t wsgi_ap_pool_cleanup_set_null(void *data_)
+{
+    void **ptr = (void **)data_;
+    *ptr = NULL;
+    return APR_SUCCESS;
+}
+
+#endif
+
+/* ------------------------------------------------------------------------- */
+
 #if (APR_MAJOR_VERSION == 0) && \
     (APR_MINOR_VERSION == 9) && \
     (APR_PATCH_VERSION < 5)

src/server/wsgi_apache.h

@@ -128,6 +128,11 @@ extern void wsgi_ap_close_listeners(void);
 #define ap_close_listeners wsgi_ap_close_listeners
 #endif
 
+#if !AP_MODULE_MAGIC_AT_LEAST(20101106,1)
+extern apr_status_t wsgi_ap_pool_cleanup_set_null(void *);
+#define ap_pool_cleanup_set_null wsgi_ap_pool_cleanup_set_null
+#endif
+
 #if (APR_MAJOR_VERSION == 0) && \
     (APR_MINOR_VERSION == 9) && \
     (APR_PATCH_VERSION < 5)