Fix up a few more implicit-function-declaration warnings on the BSDs

cde/include/EUSCompat.h

@@ -52,8 +52,12 @@ extern "C" {
 ** System V R4 based systems define the stuff we need in
 ** sys/types.h. Include that and then we are done.
 */
-#if defined(HPUX) || defined(__linux__) || defined(SunOS)
-#include <sys/types.h>
+#if defined(HPUX) || defined(__linux__) || defined(SunOS) || defined(CSRG_BASED)
+# include <sys/types.h>
+#endif
+
+#if defined(CSRG_BASED) || defined(__linux__)
+# include <sys/socket.h>
 #endif
 
 #if defined(sun) && defined(_XOPEN_SOURCE)
@@ -104,6 +108,7 @@ typedef enum {B_FALSE, B_TRUE} boolean_t;
 #endif	/* HPUX */
 
 #if defined(__linux__) || defined(CSRG_BASED)
+#include <string.h>  /* memset for libcsa and others */
 typedef enum {B_FALSE, B_TRUE} boolean_t;
 #define MAXNAMELEN      	256
 #endif

cde/programs/dthelp/dthelpprint/PrintTopics.c

@@ -49,6 +49,7 @@ $COPYRIGHT$:
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <unistd.h>
 #include <sys/stat.h>    /* for stat() */
 #if defined(sun)

cde/programs/dtlogin/server.c

@@ -47,6 +47,7 @@
  */
 
 # include	<sys/types.h>
+# include	<sys/socket.h>
 # include	<sys/signal.h>
 # include	<setjmp.h>
 # include       <errno.h>

cde/programs/dtterm/DtTermMain.c

@@ -60,6 +60,7 @@
 #include "TermPrimRenderP.h"
 #include "TermPrimLineDrawP.h"
 #include "TermPrimLineFontP.h"
+#include "TermPrimSetUtmp.h"
 #include "TermBufferP.h"
 #include "TermP.h"
 #include "TermParseTableP.h"