mesa: Fix compile error with MSVC 2013
This fixes the following compile error: src\glsl\ir_constant_expression.cpp(1405) : error C2666: 'copysign' : 3 overloads have similar conversions Cc: "10.0" <mesa-stable@lists.freedesktop.org> Reviewed-by:Brian Paul <brianp@vmware.com> (cherry picked from commit 067ad6e5)
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