Math.hxx: fix wrong macro name
_GLIBCXX_USE_C99_MATH_TR1 is the correct one. _GLIBCXX_USE_C99_MATH is always defined.
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@ -36,7 +36,7 @@
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* C99 math can be optionally omitted with gcc's libstdc++.
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* Use boost if unavailable.
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*/
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#if (defined(__GLIBCPP__) || defined(__GLIBCXX__)) && !defined(_GLIBCXX_USE_C99_MATH)
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#if (defined(__GLIBCPP__) || defined(__GLIBCXX__)) && !defined(_GLIBCXX_USE_C99_MATH_TR1)
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#include <boost/math/special_functions/round.hpp>
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using boost::math::lround;
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#else
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