Disable GLES builders and source from server compilation

SConstruct

@@ -445,7 +445,7 @@ if selected_platform in platform_list:
     if not env['verbose']:
         methods.no_verbose(sys, env)
 
-    if (True): # FIXME: detect GLES3
+    if (not env["platform"] == "server"): # FIXME: detect GLES3
         env.Append( BUILDERS = { 'GLES3_GLSL' : env.Builder(action = methods.build_gles3_headers, suffix = 'glsl.gen.h',src_suffix = '.glsl') } )
 
     scons_cache_path = os.environ.get("SCONS_CACHE")

drivers/SCsub

@@ -22,8 +22,11 @@ if env['xaudio2']:
     SConscript("xaudio2/SCsub")
 
 # Graphics drivers
-SConscript('gles3/SCsub')
-SConscript('gl_context/SCsub')
+if (env["platform"] != "server"):
+    SConscript('gles3/SCsub')
+    SConscript('gl_context/SCsub')
+else:
+    SConscript('dummy/SCsub')
 
 # Core dependencies
 SConscript("png/SCsub")