Fix a typo.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42056 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

configure.in

@@ -1853,7 +1853,7 @@ RUBY_CHECK_BUILTIN_FUNC(__builtin_clz, [__builtin_clz(0)])
 RUBY_CHECK_BUILTIN_FUNC(__builtin_clzl, [__builtin_clzl(0)])
 RUBY_CHECK_BUILTIN_FUNC(__builtin_clzll, [__builtin_clzll(0)])
 
-# Some platform neet -lrt for clock_gettime, but the other don't.
+# Some platform need -lrt for clock_gettime, but the other don't.
 if test x"$ac_cv_func_clock_gettime" != xyes; then
     # glibc 2.17 moves clock_* functions from librt to the main C library.
     # http://sourceware.org/ml/libc-announce/2012/msg00001.html