Add X11 export for testing

export_presets.cfg

@@ -25,3 +25,23 @@ application/product_name=""
 application/file_description=""
 application/copyright=""
 application/trademarks=""
+
+[preset.1]
+
+name="Linux/X11"
+platform="Linux/X11"
+runnable=false
+custom_features=""
+export_filter="all_resources"
+include_filter=""
+exclude_filter=""
+patch_list=PoolStringArray(  )
+
+[preset.1.options]
+
+texture_format/s3tc=true
+texture_format/etc=false
+texture_format/etc2=false
+binary_format/64_bits=true
+custom_template/release=""
+custom_template/debug=""