patch 8.2.0605: Vim9: cannot unlet an environment variable

Problem:    Vim9: cannot unlet an environment variable.
Solution:   Implement unlet for $VAR.
diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index 7f6d86a..7814952 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -130,6 +130,7 @@
   g:somevar = "value"
   unlet g:somevar
   unlet! g:somevar
+  unlet $SOMEVAR
 enddef
 
 def Test_disassemble_unlet()
@@ -141,7 +142,9 @@
         'unlet g:somevar.*' ..
         '\d UNLET g:somevar.*' ..
         'unlet! g:somevar.*' ..
-        '\d UNLET! g:somevar.*',
+        '\d UNLET! g:somevar.*' ..
+        'unlet $SOMEVAR.*' ..
+        '\d UNLETENV $SOMEVAR.*',
         res)
 enddef