code-style: cleanup includes

* rm unused include <sys/types.h>
* move <sys/time.h> to main.c, it's the only file that needs it.
* move TV_* macros to main.c
* let *.c files explicitly include what they need instead of including
  them at nsxiv.h

commands.c

@@ -20,6 +20,7 @@
 #include "nsxiv.h"
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/wait.h>

image.c

@@ -26,7 +26,6 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
-#include <sys/types.h>
 #include <unistd.h>
 
 #if HAVE_LIBEXIF

main.c

@@ -23,6 +23,8 @@
 #include "config.h"
 
 #include <stdlib.h>
+#include <stdarg.h>
+#include <stdio.h>
 #include <string.h>
 #include <fcntl.h>
 #include <unistd.h>
@@ -33,12 +35,20 @@
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <time.h>
+#include <sys/time.h>
 #include <X11/keysym.h>
 #include <X11/XF86keysym.h>
 
 #define MODMASK(mask) ((mask) & USED_MODMASK)
 #define BAR_SEP "  "
 
+#define TV_DIFF(t1,t2) (((t1)->tv_sec  - (t2)->tv_sec ) * 1000 + \
+                        ((t1)->tv_usec - (t2)->tv_usec) / 1000)
+#define TV_ADD_MSEC(tv,t) {             \
+  (tv)->tv_sec  += (t) / 1000;          \
+  (tv)->tv_usec += (t) % 1000 * 1000;   \
+}
+
 typedef struct {
 	struct timeval when;
 	bool active;

nsxiv.h

@@ -20,11 +20,8 @@
 #ifndef NSXIV_H
 #define NSXIV_H
 
-#include <stdarg.h>
+#include <stddef.h>
 #include <stdbool.h>
-#include <stdio.h>
-#include <sys/time.h>
-#include <sys/types.h>
 #include <Imlib2.h>
 #include <X11/Xlib.h>
 
@@ -39,17 +36,8 @@
 #define ABS(a) ((a) > 0 ? (a) : -(a))
 
 #define ARRLEN(a) (sizeof(a) / sizeof((a)[0]))
-
 #define STREQ(s1,s2) (strcmp((s1), (s2)) == 0)
 
-#define TV_DIFF(t1,t2) (((t1)->tv_sec  - (t2)->tv_sec ) * 1000 + \
-                        ((t1)->tv_usec - (t2)->tv_usec) / 1000)
-
-#define TV_ADD_MSEC(tv,t) {             \
-  (tv)->tv_sec  += (t) / 1000;          \
-  (tv)->tv_usec += (t) % 1000 * 1000;   \
-}
-
 typedef enum {
 	MODE_ALL,
 	MODE_IMAGE,

options.c

@@ -21,6 +21,7 @@
 #include "version.h"
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <unistd.h>
 

thumbs.c

@@ -22,9 +22,9 @@
 #include "config.h"
 
 #include <errno.h>
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <utime.h>

util.c

@@ -21,8 +21,9 @@
 
 #include <assert.h>
 #include <stdlib.h>
+#include <stdarg.h>
+#include <stdio.h>
 #include <string.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <errno.h>