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vsnprintf.c: prefix with precision

• vsnprintf.c (BSD_vfprintf): sign and hex-prefix should not be
  counted in precision. [ruby-dev:47714] [Bug #8916]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58210 b2dd03c8-39d4-4d8f-98ff-823fe69b080e