Reintroduce header guards for IMGUI_DEFINE_MATH_OPERATORS to fix compiler warnings
#546
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The commit 33c5a96 removed the definition for
IMGUI_DEFINE_MATH_OPERATORSincluding a header guard fromimplot_internal.hand moved it into the unit filesimplot.cppandimplot_items.cppbut without a corresponding check whetherIMGUI_DEFINE_MATH_OPERATORSwas already defined.When
IMGUI_DEFINE_MATH_OPERATORSis set externally, e.g. via target compile definitions, this now leads to compiler warnings. The PR fixes these compiler warnings by reintroducing header guards forIMGUI_DEFINE_MATH_OPERATORS.