file.c: unnecessary #undef
* file.c (flock): remove unnecessary #undef flock, trace of green thread polling. patched by Rohan Garg. [Bug #10551] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48629 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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