Move the global dpy behind a distinct BUILD rule.

bazel/wmaker/BUILD.bazel

@@ -4,6 +4,13 @@ cc_library(
     visibility = ["//visibility:public"],
 )
 
+cc_library(
+    name = "global_display",
+    hdrs = ["global_display.h"],
+    srcs = ["global_display.c"],
+    deps = ["@x11//:lib"],
+)
+
 cc_library(
     name = "wconfig",
     hdrs = ["wconfig.h"],

bazel/wmaker/WindowMaker.h

@@ -284,8 +284,6 @@ enum {
 
 
 /****** Global Variables  ******/
-extern Display	*dpy;
-
 extern struct wmaker_global_variables {
 	/* Tracking of the state of the program */
 	struct {

bazel/wmaker/global_display.c

@@ -0,0 +1,5 @@
+#include "wmaker/global_display.h"
+
+#include "X11/Xlib.h"
+
+Display *dpy;

bazel/wmaker/global_display.h

@@ -0,0 +1,8 @@
+#ifndef WGLOBAL_DISPLAY_H_
+#define WGLOBAL_DISPLAY_H_
+
+#include "X11/Xlib.h"
+
+extern Display *dpy;
+
+#endif  // WGLOBAL_DISPLAY_H_

bazel/wmaker/main.c

@@ -65,8 +65,6 @@ struct wmaker_global_variables w_global;
 
 /* general info */
 
-Display *dpy;
-
 char *ProgName;
 
 struct WPreferences wPreferences;