sysutils/wmflame: fix the port's build against -fno-common

Ensure that there is only one variable definition per each object, as
the C (and C++) standards mandated for years and compilers started to
enforce as of recently (Clang 11, GCC 10).

While we are at it, at missing `xext' component to the USE_XORG list.

PR:	267600

sysutils/wmflame/Makefile

@@ -11,11 +11,8 @@ WWW=		http://web.novalis.org/
 
 LICENSE=	GPLv2
 
-BROKEN_FreeBSD_13=	ld: error: duplicate symbol: Root
-BROKEN_FreeBSD_14=	ld: error: duplicate symbol: Root
-
 USES=		gmake xorg
-USE_XORG=	x11 xpm
+USE_XORG=	x11 xext xpm
 
 PLIST_FILES=	bin/wmflame
 

sysutils/wmflame/files/patch-wmgeneral_wmgeneral.c

@@ -0,0 +1,12 @@
+--- ../wmgeneral/wmgeneral.c.orig	1999-07-12 03:30:14 UTC
++++ ../wmgeneral/wmgeneral.c
+@@ -57,6 +57,9 @@
+  /* X11 Variables */
+ /*****************/
+ 
++Display		*display;
++Window		Root, iconwin, win;
++XpmIcon		wmgen;
+ int			screen;
+ int			x_fd;
+ int			d_depth;

sysutils/wmflame/files/patch-wmgeneral_wmgeneral.h

@@ -0,0 +1,15 @@
+--- ../wmgeneral/wmgeneral.h.orig	1999-06-17 06:48:13 UTC
++++ ../wmgeneral/wmgeneral.h
+@@ -36,9 +36,9 @@ typedef struct {
+  /* Global variable */
+ /*******************/
+ 
+-Display		*display;
+-Window          Root, iconwin, win;
+-XpmIcon		wmgen;
++extern Display		*display;
++extern Window		Root, iconwin, win;
++extern XpmIcon		wmgen;
+ 
+   /***********************/
+  /* Function Prototypes */