Untag passing set_encoding_by_bom methods_spec and MRI test

Author: bjfish

spec/tags/truffle/methods_tags.txt

@@ -57,7 +57,6 @@ fails:Public methods on TracePoint should include parameters
 fails:Public methods on TracePoint should include raised_exception
 fails:Public methods on TracePoint should include return_value
 fails:Public methods on ENV.singleton_class should include freeze
-fails:Public methods on IO should include set_encoding_by_bom
 fails:Public methods on BasicSocket should include read_nonblock
 fails:Public methods on BasicSocket should include write_nonblock
 fails:Public methods on Socket should not include local_address

test/mri/excludes/TestIO_M17N.rb

@@ -147,9 +147,3 @@
 exclude :test_bom_non_reading, "needs investigation"
 exclude :test_stdin, "needs investigation"
 exclude :"test_strip_bom:UTF-16LE", "needs investigation"
-exclude :test_strip_bom_no_conv, "needs investigation"
-exclude :"test_strip_bom:UTF-16BE", "needs investigation"
-exclude :"test_strip_bom:UTF-32BE", "needs investigation"
-exclude :"test_strip_bom:UTF-32LE", "needs investigation"
-exclude :"test_strip_bom:UTF-8", "needs investigation"
-exclude :test_strip_bom_no_bom, "needs investigation"