Use anonymous rather than name-based shm for shmcb.
Name-based shm is overeager in use of _EXCL so causes
startup failures after unclean shutdown; #80520.

--- httpd-2.0.46/modules/ssl/ssl_scache_shmcb.c.shmcb
+++ httpd-2.0.46/modules/ssl/ssl_scache_shmcb.c
@@ -364,18 +364,9 @@
     apr_size_t shm_segsize;
     apr_status_t rv;
 
-    /*
-     * Create shared memory segment
-     */
-    if (mc->szSessionCacheDataFile == NULL) {
-        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
-                     "SSLSessionCache required");
-        ssl_die();
-    }
-
     if ((rv = apr_shm_create(&(mc->pSessionCacheDataMM), 
                              mc->nSessionCacheDataSize, 
-                             mc->szSessionCacheDataFile,
+                             NULL,
                              mc->pPool)) != APR_SUCCESS) {
         char buf[100];
         ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,