C: add missing include

core/src/main/resources/org/teavm/backend/c/core.h

@@ -5,6 +5,7 @@
 #include "definitions.h"
 #include "heapdump.h"
 #include "memory.h"
+#include <stdlib.h>
 
 #if TEAVM_MEMORY_TRACE
     #include "heaptrace.h"

core/src/main/resources/org/teavm/backend/c/fiber.c

@@ -1,5 +1,8 @@
 #include "fiber.h"
 #include "definitions.h"
+#include <stddef.h>
+#include <locale.h>
+#include <time.h>
 
 #if TEAVM_UNIX
     #include <signal.h>

core/src/main/resources/org/teavm/backend/c/file.c

@@ -1,6 +1,7 @@
 #include "file.h"
 #include "string.h"
 #include "time.h"
+#include "date.h"
 #include "definitions.h"
 #include <stdlib.h>
 #include <errno.h>

core/src/main/resources/org/teavm/backend/c/log.c

@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <inttypes.h>
+#include <wchar.h>
 
 #if TEAVM_WINDOWS
     #include <Windows.h>

core/src/main/resources/org/teavm/backend/c/memory.c

@@ -1,6 +1,7 @@
 #include "memory.h"
 #include "definitions.h"
 #include <stdlib.h>
+#include <string.h>
 
 #if TEAVM_UNIX
     #include <unistd.h>

core/src/main/resources/org/teavm/backend/c/time.c

@@ -1,6 +1,7 @@
 #include "time.h"
 #include "definitions.h"
 #include <time.h>
+#include <math.h>
 
 #if TEAVM_WINDOWS
     #include <Windows.h>

core/src/main/resources/org/teavm/backend/c/virtcall.c

@@ -1,4 +1,3 @@
-#pragma once
 #include "virtcall.h"
 #include "definitions.h"
 #include <stdlib.h>