Remove unnecessary line

Author: KitaitiMakoto

bindings/ruby/ext/extconf.rb

@@ -54,6 +54,5 @@ def tsort_each_child(node, &block)
     cmake-targets:
     #{"\t"}#{cmake} -S sources -B build -D BUILD_SHARED_LIBS=OFF -D CMAKE_ARCHIVE_OUTPUT_DIRECTORY=#{__dir__} -D CMAKE_POSITION_INDEPENDENT_CODE=ON
     #{"\t"}#{cmake} --build build --config Release --target common whisper
-    #{"\t"}
   EOF
 end