Remove blank line from the top of Ruby files

benchmark/bm_fib.rb

@@ -1,4 +1,3 @@
-
 def fib n
   return n if n < 2
   fib(n-2) + fib(n-1)

build_config/cross-mingw-winetest.rb

@@ -1,4 +1,3 @@
-
 # Cross-compile using MinGW and test using Wine.
 #
 # Steps:

mrbgems/mruby-toplevel-ext/mrblib/toplevel.rb

@@ -1,4 +1,3 @@
-
 def self.include(*modules)
   self.class.include(*modules)
 end

test/t/comparable.rb

@@ -1,4 +1,3 @@
-
 assert('Comparable#<', '15.3.3.2.1') do
   class Foo
     include Comparable