Use single quotes for RuboCop in cext_constants.rb

Author: eregon

lib/truffle/truffle/cext_constants.rb

@@ -270,7 +270,7 @@ def rb_eZeroDivError
   end
 
   def rb_eFatal
-    Truffle::CExt.rb_const_get(Object, "fatal")
+    Truffle::CExt.rb_const_get(Object, 'fatal')
   end
 
   def rb_stdin

tool/generate-cext-constants.rb

@@ -76,7 +76,7 @@
     IO::WaitReadable,
     IO::WaitWritable,
     [ZeroDivisionError, 'ZeroDivError'],
-    ['Truffle::CExt.rb_const_get(Object, "fatal")', 'eFatal'],
+    ['Truffle::CExt.rb_const_get(Object, \'fatal\')', 'eFatal'],
     ['$stdin', 'stdin'],
     ['$stdout', 'stdout'],
     ['$stderr', 'stderr'],