[ wip ] Add chezscheme mark to the generated files

This will allow us in the future (after the Idris version release)
to use the direct `#!bwp` syntax for the BWP value.

src/Compiler/Scheme/Chez.idr

@@ -90,6 +90,7 @@ schHeader chez libs whole
         else "") ++ """
     ;; \{ generatedString "Chez" }
     (import (chezscheme))
+    #!chezscheme
     (case (machine-type)
       [(i3fb ti3fb a6fb ta6fb) #f]
       [(i3le ti3le a6le ta6le tarm64le) (load-shared-object "libc.so.6")]

src/Compiler/Scheme/ChezSep.idr

@@ -37,6 +37,7 @@ schHeader : List String -> List String -> String
 schHeader libs compilationUnits = """
   (import (chezscheme) (support)
       \{ unwords ["(" ++ cu ++ ")" | cu <- compilationUnits] })
+  #!chezscheme
   (case (machine-type)
     [(i3le ti3le a6le ta6le tarm64le) (load-shared-object "libc.so.6")]
     [(i3osx ti3osx a6osx ta6osx tarm64osx) (load-shared-object "libc.dylib")]