Add tests for Kernel#respond_to? without #respond_to_missing?

`#respond_to?` should work with unknown names even if `#respond_to_missing?` is not defined.

Author: trinistr

core/io/buffer/clear_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer#clear" do
+  it "needs to be reviewed for spec completeness"
+end

core/io/buffer/comparison_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer#<=>" do
+  it "needs to be reviewed for spec completeness"
+end

core/io/buffer/constants_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer::BIG_ENDIAN" do
+end

core/io/buffer/copy_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer#copy" do
+  it "needs to be reviewed for spec completeness"
+end

core/io/buffer/each_byte_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer#each_byte" do
+  it "needs to be reviewed for spec completeness"
+end

core/io/buffer/each_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer#each" do
+  it "needs to be reviewed for spec completeness"
+end

core/io/buffer/get_string_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer#get_string" do
+  it "needs to be reviewed for spec completeness"
+end

core/io/buffer/get_value_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer#get_value" do
+  it "needs to be reviewed for spec completeness"
+end

core/io/buffer/get_values_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer#get_values" do
+  it "needs to be reviewed for spec completeness"
+end

core/io/buffer/hexdump_spec.rb

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+require_relative '../../../spec_helper'
+
+describe "IO::Buffer#hexdump" do
+  it "needs to be reviewed for spec completeness"
+end