Update Syntax.icl

In clean-compiler-and-rts/6b890e35e78c6cde75947593efd4b7776caf5b0b the restriction was lifted. It appeared that it forgot to copy it to the icl
3 jobs for eadt_extension_description in 6 minutes and 33 seconds (queued for 1 minute and 47 seconds)
Status Job ID Name Coverage
  Test
failed #37284
backend

00:03:22

passed #37285
frontend

00:02:35

passed #37286
stats

00:00:35

 
Name Stage Failure
failed
backend Test
Compiling System.Process
Compiling System.FilePath
Compiling System._FilePath
Compiling Cloogle.API
Compiling Data.Maybe.Ord
Compiling Cloogle.DB
make: *** [CloogleServer] Error 1
Makefile:25: recipe for target 'CloogleServer' failed
ERROR: Job failed: exit code 1