openscad: fix build error

boost/detail/endian.hpp does not seem to be used in import.cc so no need to include it

packages/openscad/src-import.cc.patch

@@ -0,0 +1,10 @@
+--- ../import.cc.orig	2020-07-14 09:26:06.065405741 +0200
++++ ./src/import.cc	2020-07-14 09:33:39.557419903 +0200
+@@ -50,7 +50,6 @@
+ #include <boost/assign/std/vector.hpp>
+ using namespace boost::assign; // bring 'operator+=()' into scope
+ 
+-#include <boost/detail/endian.hpp>
+ #include <cstdint>
+ 
+ extern PolySet * import_amf(std::string, const Location &loc);