sysutils/wmmon: fix for -fno-common

[NilsOla Nilsson]

I use wmmon frequently. 

The attached patch is tested om amd64.
on:
OpenBSD 6.9-beta (GENERIC) #329: Tue Feb 16 09:49:35 MST 2021

-- 
Nils Ola Nilsson, 🐞 email nils...@abc.se, tel +46-70-374 69 89

*** wmgeneral/wmgeneral.c.orig  Sun Feb 21 19:47:44 2021
--- wmgeneral/wmgeneral.c       Sun Feb 21 19:55:30 2021
***************
*** 50,55 ****
--- 50,56 ----
  GC                    NormalGC;
  XpmIcon               wmgen;
  Pixmap                pixmask;
+ Display               *display;
  
    /*****************/
   /* Mouse Regions */

*** wmgeneral/wmgeneral.h.orig  Sun Feb 21 19:47:53 2021
--- wmgeneral/wmgeneral.h       Sun Feb 21 19:48:33 2021
***************
*** 28,34 ****
   /* Global variable */
  /*******************/
  
! Display               *display;
  
    /***********************/
   /* Function Prototypes */
--- 28,34 ----
   /* Global variable */
  /*******************/
  
! extern Display                *display;
  
    /***********************/
   /* Function Prototypes */

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