Fedora Rawhide builds fail without stdlib include

Implicit declarations of malloc, free, atoi, and others are considered an
error now.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

core/deco.c

@@ -17,6 +17,7 @@
  * restore_deco_state()
  * dump_tissues()
  */
+#include <stdlib.h>
 #include <math.h>
 #include <string.h>
 #include <assert.h>

core/dive.h

@@ -10,6 +10,7 @@
 #include "picture.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 
 #ifdef __cplusplus
 extern "C" {

core/import-cobalt.c

@@ -4,6 +4,7 @@
 #pragma clang diagnostic ignored "-Wmissing-field-initializers"
 #endif
 
+#include <stdlib.h>
 #include "ssrf.h"
 #include "dive.h"
 #include "divesite.h"

core/import-seac.c

@@ -4,6 +4,7 @@
 #pragma clang diagnostic ignored "-Wmissing-field-initializers"
 #endif
 
+#include <stdlib.h>
 #include "qthelper.h"
 #include "ssrf.h"
 #include "dive.h"

core/libdivecomputer.c

@@ -6,6 +6,7 @@
 
 #include "ssrf.h"
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <inttypes.h>
 #include <string.h>

core/liquivision.c

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <string.h>
+#include <stdlib.h>
 
 #include "ssrf.h"
 #include "divesite.h"

core/planner.c

@@ -5,6 +5,7 @@
  *
  * (c) Dirk Hohndel 2013
  */
+#include <stdlib.h>
 #include <assert.h>
 #include <unistd.h>
 #include <ctype.h>

core/plannernotes.c

@@ -9,6 +9,7 @@
 #include <unistd.h>
 #include <ctype.h>
 #include <string.h>
+#include <stdlib.h>
 #include "dive.h"
 #include "deco.h"
 #include "units.h"

core/profile.c

@@ -7,6 +7,7 @@
 #include <limits.h>
 #include <string.h>
 #include <assert.h>
+#include <stdlib.h>
 
 #include "dive.h"
 #include "divelist.h"

core/subsurfacestartup.c

@@ -11,6 +11,7 @@
 
 #include <stdbool.h>
 #include <string.h>
+#include <stdlib.h>
 
 extern void show_computer_list();
 

core/uemis-downloader.c

@@ -20,6 +20,7 @@
 #include <unistd.h>
 #include <string.h>
 #include <errno.h>
+#include <stdlib.h>
 
 #include "gettext.h"
 #include "libdivecomputer.h"

core/uemis.c

@@ -9,6 +9,7 @@
  */
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include "gettext.h"