fix: fix asm support

Author: SpringMT

ext/zstdruby/extconf.rb

@@ -4,7 +4,7 @@
 $CPPFLAGS += " -fdeclspec" if CONFIG['CXX'] =~ /clang/
 
 Dir.chdir File.expand_path('..', __FILE__) do
-    $srcs = Dir['**/*.c']
+  $srcs = Dir['**/*.c', '**/*.S']
 
     Dir.glob('libzstd/*') do |path|
         if Dir.exist?(path)

spec/zstd-ruby_spec.rb

@@ -14,9 +14,9 @@
 
   describe 'compress' do
     it 'should work' do
-      compressed = Zstd.compress('abc')
+      compressed = Zstd.compress('abc' * 10)
       expect(compressed).to be_a(String)
-      expect(compressed).to_not eq('abc')
+      expect(compressed).to_not eq('abc' * 10)
     end
 
     it 'should support compression levels' do