s_client: avoid warning on Windows/MS-DOS systems
it appears when using gcc/mingw: ``` apps/s_client.c:815:9: warning: variable 'at_eof' set but not used [-Wunused-but-set-variable] int at_eof = 0; ^~~~~~ ``` Reviewed-by:Matt Caswell <matt@openssl.org> Reviewed-by:
Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1512)
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