Make all required includes explicit

Information as seen by IWYU 0.12 + clang 9 on Linux

1 files changed, 10 insertions, 7 deletions

diff --git a/Panel.c b/Panel.c
index 76e45d6e..782cbdc1 100644
--- a/Panel.c
+++ b/Panel.c
@@ -7,17 +7,20 @@ in the source distribution for its full text.
 
 #include "Panel.h"
 
+#include <assert.h>
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+
 #include "CRT.h"
-#include "RichString.h"
 #include "ListItem.h"
+#include "Macros.h"
+#include "ProvideCurses.h"
+#include "RichString.h"
 #include "XUtils.h"
 
-#include <math.h>
-#include <stdbool.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <string.h>
-#include <assert.h>
 
 const PanelClass Panel_class = {
    .super = {