scons: Updates for targets/egl-static.

Update SConscripts to re-enable or add support for EGL on windows and
x11 platforms respectively.  targets/egl-gdi is replaced by
targets/egl-static, where "-static" means pipe drivers and state
trackers are linked to statically by egl_gallium, and egl_gallium is a
built-in driver of libEGL.  There is no more egl_gallium.dll on Windows.
diff --git a/src/SConscript b/src/SConscript
index c42d9bf..116c9b3 100644
--- a/src/SConscript
+++ b/src/SConscript
@@ -1,16 +1,16 @@
 Import('*')
 
-SConscript('mapi/vgapi/SConscript')
-
 if env['platform'] == 'windows':
-    SConscript('egl/main/SConscript')
     SConscript('talloc/SConscript')
 
 SConscript('glsl/SConscript')
 SConscript('mapi/glapi/SConscript')
 SConscript('mesa/SConscript')
 
+SConscript('mapi/vgapi/SConscript')
+
 if env['platform'] != 'embedded':
+    SConscript('egl/main/SConscript')
     SConscript('glut/glx/SConscript')
 
 SConscript('gallium/SConscript')