Refactor extern definition of conn and root_screen

libi3/dpi.c

@@ -8,8 +8,6 @@
 #include "libi3.h"
 #include <math.h>
 
-extern xcb_screen_t *root_screen;
-
 /*
  * Convert a logical amount of pixels (e.g. 2 pixels on a “standard” 96 DPI
  * screen) to a corresponding amount of physical pixels on a standard or retina

libi3/font.c

@@ -19,9 +19,6 @@
 
 #include "libi3.h"
 
-extern xcb_connection_t *conn;
-extern xcb_screen_t *root_screen;
-
 static const i3Font *savedFont = NULL;
 
 #if PANGO_SUPPORT

libi3/get_mod_mask.c

@@ -12,8 +12,6 @@
 
 #include "libi3.h"
 
-extern xcb_connection_t *conn;
-
 /*
  * All-in-one function which returns the modifier mask (XCB_MOD_MASK_*) for the
  * given keysymbol, for example for XCB_NUM_LOCK (usually configured to mod2).