Upstream commit e02f3580311d50b617427652ff77988f6bd62d9d adding Boost 1.76
compatibility.

diff --git a/librecad/src/lib/engine/rs_ellipse.cpp b/librecad/src/lib/engine/rs_ellipse.cpp
index 291f734ea..d47bf6ca4 100644
--- a/librecad/src/lib/engine/rs_ellipse.cpp
+++ b/librecad/src/lib/engine/rs_ellipse.cpp
@@ -48,6 +48,9 @@
 #include <boost/version.hpp>
 #include <boost/math/tools/roots.hpp>
 #include <boost/math/special_functions/ellint_2.hpp>
+#if BOOST_VERSION > 104500
+#include <boost/math/tools/tuple.hpp>
+#endif
 #endif
 
 namespace{