move srand() call from ssl_rand_choosenum() to ssl_init_Child()

this was being called twice per-connection with 'SSLRandom connect builtin'
configured (which is in the default config)

this also gets rid of two time() syscalls per-connection

PR:
Obtained from:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92232 13f79535-47bb-0310-9956-ffa450edef68