Cascade no-dgram from no-sock in Configure not e_os.h

e_os.h was defining OPENSSL_NO_DGRAM if OPENSSL_NO_SOCK was defined.
This causes link problems on Windows because the generated .def files
still contain the DGRAM symbols even though they have not been compiled.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Configure

@@ -364,7 +364,7 @@ my @disable_cascades = (
     "ec"		=> [ "ecdsa", "ecdh" ],
 
     "dgram"		=> [ "dtls", "sctp" ],
-    "sock"		=> [ "sctp" ],
+    "sock"		=> [ "dgram" ],
     "dtls"		=> [ @dtls ],
 
     # SSL 3.0, (D)TLS 1.0 and TLS 1.1 require MD5 and SHA

e_os.h

@@ -392,10 +392,6 @@ extern FILE *_imp___iob;
 
 /*************/
 
-# if defined(OPENSSL_NO_SOCK) && !defined(OPENSSL_NO_DGRAM)
-#  define OPENSSL_NO_DGRAM
-# endif
-
 # ifdef USE_SOCKETS
 #  ifdef OPENSSL_NO_SOCK
 #  elif defined(WINDOWS) || defined(MSDOS)