egl: Fix non-dri SCons builds re #87657

* Revert change to egl main producing Shared Libraries
* Check for dri before including dri code

src/SConscript

@@ -33,7 +33,8 @@ if not env['embedded']:
     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')

src/egl/main/SConscript

@@ -33,10 +33,11 @@ else:
         '_EGL_NATIVE_PLATFORM=_EGL_PLATFORM_X11',
         '_EGL_OS_UNIX',
     ])
-    env.Prepend(LIBS = [
-        egl_dri2,
-        libloader,
-    ])
+    if env['dri']:
+        env.Prepend(LIBS = [
+            egl_dri2,
+            libloader,
+        ])
 
 env.Append(CPPPATH = [
     '#/include',
@@ -46,12 +47,8 @@ env.Append(CPPPATH = [
 # parse Makefile.sources
 egl_sources = env.ParseSourceList('Makefile.sources', 'LIBEGL_C_FILES')
 
-# libEGL.dll
-env['LIBPREFIX'] = 'lib'
-env['SHLIBPREFIX'] = 'lib'
-
-egl = env.SharedLibrary(
-    target = 'EGL',
+egl = env.ConvenienceLibrary(
+    target = 'egl',
     source = egl_sources,
 )