gfxlib2: fix linux GFX_NO_FRAME + GFX_OPENGL freezing at exit

- freezing due to dead lock between exit routines
- driver was waiting on window thread to exit, but window thread waiting on client frame to unmap
- resolves github issue # 122

(cherry picked from commit 59af0f0)

# Conflicts:
#	changelog.txt

Author: jayrm

changelog.txt

@@ -16,6 +16,7 @@ Version 1.07.2
 - sf.net #921: gfxlib: horizontal line drawing on 8-bit image was using wrong bpp
 - github #258: on windows directx and gdi drivers, only show window after intialization is complete (adeyblue)
 - sf.net #925: CSIGN/CUNSG preserve size when converting pointers on 64-bit and implict conversion of STEP value in FOR...NEXT statement
+- github #122: gfxlib2: linux GFX_NO_FRAME + GFX_OPENGL freezing at exit due to a dead lock between exit routines
 
 
 Version 1.07.1

src/gfxlib2/unix/gfx_driver_opengl_x11.c

@@ -111,10 +111,12 @@ static void opengl_window_exit(void)
 	fb_hX11WaitUnmapped(fb_x11.window);
 	if (fb_x11.flags & DRIVER_FULLSCREEN) {
 		XUnmapWindow(fb_x11.display, fb_x11.fswindow);
-	XSync(fb_x11.display, False);
+		XSync(fb_x11.display, False);
 	} else {
-		XUnmapWindow(fb_x11.display, fb_x11.wmwindow);
-		fb_hX11WaitUnmapped(fb_x11.wmwindow);
+		if( !(fb_x11.flags & DRIVER_NO_FRAME) ) {
+			XUnmapWindow(fb_x11.display, fb_x11.wmwindow);
+			fb_hX11WaitUnmapped(fb_x11.wmwindow);
+		}
 	}
 	//usleep(500);
 	XSync(fb_x11.display, False);