egl: Fix non-dri SCons builds re #87657

* Revert change to egl main producing Shared Libraries
* Check for dri before including dri code
diff --git a/src/SConscript b/src/SConscript
index eb4cd3c..c25adc7 100644
--- a/src/SConscript
+++ b/src/SConscript
@@ -33,7 +33,8 @@
     if env['platform'] not in ('cygwin', 'darwin', 'freebsd', 'haiku', 'windows'):
         SConscript('glx/SConscript')
     if env['platform'] not in ['darwin', 'haiku', 'sunos']:
-        SConscript('egl/drivers/dri2/SConscript')
+        if env['dri']:
+            SConscript('egl/drivers/dri2/SConscript')
         SConscript('egl/main/SConscript')
     if env['platform'] == 'haiku':
         SConscript('egl/drivers/haiku/SConscript')