Move more socket stuff

The socket stuff for DJGPP and VMS was only partially moved to
include/internal/sockets.h...

Remains vxWorks.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4254)

e_os.h

@@ -91,7 +91,6 @@ extern "C" {
 # endif
 
 # if defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI)
-#  define NO_SYS_PARAM_H
 #  define NO_CHMOD
 #  define NO_SYSLOG
 # endif
@@ -113,7 +112,6 @@ extern "C" {
 # endif
 
 # ifdef WIN32
-#  define NO_SYS_UN_H
 #  undef get_last_sys_error
 #  undef clear_sys_error
 #  define get_last_sys_error()    GetLastError()
@@ -129,10 +127,6 @@ extern "C" {
 #  ifdef __DJGPP__
 #   include <unistd.h>
 #   include <sys/stat.h>
-#   include <sys/socket.h>
-#   include <sys/un.h>
-#   include <tcp.h>
-#   include <netdb.h>
 #   define _setmode setmode
 #   define _O_TEXT O_TEXT
 #   define _O_BINARY O_BINARY
@@ -311,9 +305,6 @@ extern FILE *_imp___iob;
   */
 #   define EXIT(n)  exit((n) ? (((n) << 3) | 2 | 0x10000000 | 0x35a000) : 1)
 
-#   define NO_SYS_PARAM_H
-#   define NO_SYS_UN_H
-
 #   define DEFAULT_HOME "SYS$LOGIN:"
 
 #  else

include/internal/sockets.h

@@ -10,24 +10,39 @@
 
 #ifndef HEADER_OPENSSL_SOCKETS
 
+# if defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_UEFI)
+#  define NO_SYS_PARAM_H
+# endif
+# ifdef WIN32
+#  define NO_SYS_UN_H
+# endif
+# ifdef OPENSSL_SYS_VMS
+#  define NO_SYS_PARAM_H
+#  define NO_SYS_UN_H
+# endif
+
 # ifdef OPENSSL_NO_SOCK
 
 # elif defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_MSDOS)
-#  if !defined(__DJGPP__)
+#  if defined(__DJGPP__)
-#   if defined(_WIN32_WCE) && _WIN32_WCE<410
+#   include <sys/socket.h>
-#    define getservbyname _masked_declaration_getservbyname
+#   include <sys/un.h>
-#   endif
+#   include <tcp.h>
-#   if !defined(IPPROTO_IP)
+#   include <netdb.h>
-     /* winsock[2].h was included already? */
+#  elif defined(_WIN32_WCE) && _WIN32_WCE<410
-#    include <winsock.h>
+#   define getservbyname _masked_declaration_getservbyname
-#   endif
+#  endif
-#   ifdef getservbyname
+#  if !defined(IPPROTO_IP)
+    /* winsock[2].h was included already? */
+#   include <winsock.h>
+#  endif
+#  ifdef getservbyname
      /* this is used to be wcecompat/include/winsock_extras.h */
-#    undef getservbyname
+#   undef getservbyname
 struct servent *PASCAL getservbyname(const char *, const char *);
-#   endif
+#  endif
 
-#   ifdef _WIN64
+#  ifdef _WIN64
 /*
  * Even though sizeof(SOCKET) is 8, it's safe to cast it to int, because
  * the value constitutes an index in per-process table of limited size
@@ -35,10 +50,8 @@ struct servent *PASCAL getservbyname(const char *, const char *);
  * Windows run on happen to be two's-complement, which allows to
  * interchange INVALID_SOCKET and -1.
  */
-#    define socket(d,t,p)   ((int)socket(d,t,p))
+#   define socket(d,t,p)   ((int)socket(d,t,p))
-#    define accept(s,f,l)   ((int)accept(s,f,l))
+#   define accept(s,f,l)   ((int)accept(s,f,l))
-#   endif
-#  else
 #  endif
 
 # else