Merge pull request #15510 from kaspar030/add_missing_includes

xtimer, ztimer: add some missing includes

sys/xtimer/xtimer.c

@@ -23,6 +23,7 @@
 #include <string.h>
 
 #include "xtimer.h"
+#include "msg.h"
 #include "mutex.h"
 #include "rmutex.h"
 #include "thread.h"

sys/ztimer/convert.c

@@ -21,6 +21,7 @@
  */
 
 #include <stdio.h>
+#include <inttypes.h>
 
 #include "ztimer/convert.h"
 

sys/ztimer/convert_frac.c

@@ -23,6 +23,7 @@
  */
 
 #include <stdint.h>
+#include <inttypes.h>
 
 #include "frac.h"
 #include "assert.h"

sys/ztimer/convert_shift.c

@@ -21,6 +21,7 @@
  */
 
 #include <stdio.h>
+#include <inttypes.h>
 
 #include "ztimer/convert.h"
 #include "ztimer/convert_shift.h"

sys/ztimer/core.c

@@ -24,6 +24,7 @@
  */
 #include <assert.h>
 #include <stdint.h>
+#include <inttypes.h>
 
 #include "kernel_defines.h"
 #include "irq.h"