Get rid of malloc.h.

This is a non-POSIX/ISO-C header.  It is ok to include this on Linux, but it
is obsolete on BSD; FreeBSD even throws an error if you include it with
__STDC__ defined.  Every system should nowadays have malloc() defined in
stdlib.h.

Diff is largely mechanical, replacing malloc.h with stdlib.h where it is not
yet included anyway.

cde/lib/tt/lib/api/c/api_storage.h

@@ -37,7 +37,6 @@
 #define _API_STORAGE_H
 
 #include <stdlib.h>
-#include <malloc.h>
 #include "util/tt_object.h"
 #include "util/tt_list.h"
 

cde/lib/tt/lib/api/c/api_xdr.C

@@ -35,13 +35,10 @@
  */
 
 #include "tt_options.h"
-#if defined(OPT_BUG_SUNOS_4) && defined(__GNUG__)
-#	include <stdlib.h>
-#endif
+#include <stdlib.h>
 #include <rpc/rpc.h>
 #include "api/c/api_xdr.h"
 #include <mp/mp_xdr_functions.h>
-#include <malloc.h>
 
 bool_t
 _tt_xdr_cstring_list(XDR *xdrs, char ***ar)

cde/lib/tt/lib/api/dnd/ttdnd.c

@@ -33,7 +33,7 @@
  */
 #include <stdio.h>
 #include <string.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include "api/c/tt_c.h"
 #include "ttdnd.h"
 

cde/lib/tt/lib/mp/mp_desktop.C

@@ -58,7 +58,7 @@ extern "C" {  extern int ioctl 	(int, int, ...) ; };
 #include "mp/mp_desktop.h"
 #include "mp/mp_mp.h"
 #include <unistd.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include "util/tt_gettext.h"
 
 static int parse_Xdisplay_string(_Tt_string display,

cde/lib/tt/lib/mp/mp_mp.C

@@ -46,7 +46,7 @@
 #include "api/c/api_error.h"
 #include <errno.h>
 #include <sys/resource.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include "tt_options.h"
 
 #if defined(_AIX)

cde/lib/tt/lib/util/frozen.tt_trace_gram.c

@@ -101,7 +101,7 @@ typedef union
 # define _TT_TRACE_LINETERM 280
 # define _TT_TRACE_PARSE_EOF 281
 
-#include <malloc.h>
+#include <stdlib.h>
 #include <memory.h>
 #include <values.h>
 

cde/lib/tt/lib/util/tt_new.C

@@ -37,7 +37,6 @@
 
 #include <stdlib.h>
 #include <stdio.h>
-#include <malloc.h>
 #include <string.h>
 #include <errno.h>
 #include "util/tt_new.h"