call getpid() once at child init and save in the SSLModConfigRec

to avoid getpid() calls at request time
PR:
Obtained from:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92231 13f79535-47bb-0310-9956-ffa450edef68

modules/ssl/ssl_engine_rand.c

@@ -136,7 +136,7 @@ int ssl_rand_seed(server_rec *s, apr_pool_t *p, ssl_rsctx_t nCtx, char *prefix)
                 /*
                  * seed in the current process id (usually just 4 bytes)
                  */
-                pid = getpid();
+                pid = mc->pid;
                 l = sizeof(pid_t);
                 RAND_seed((unsigned char *)&pid, l);
                 nDone += l;