Avoid ODR violation for `type_caster<mamba::fs::u8path>` (#3903)

Signed-off-by: Julien Jerphanion <git@jjerphan.xyz>

libmambapy/src/libmambapy/bindings/path_caster.hpp

@@ -4,6 +4,9 @@
 //
 // The full license is in the file LICENSE, distributed with this software.
 
+#ifndef LIBMAMBAPY_PATH_CASTER_HPP
+#define LIBMAMBAPY_PATH_CASTER_HPP
+
 #include <pybind11/pybind11.h>
 #include <pybind11/stl/filesystem.h>
 
@@ -19,3 +22,5 @@ namespace PYBIND11_NAMESPACE
         };
     }
 }
+
+#endif

libmambapy/src/libmambapy/bindings/specs.cpp

@@ -26,6 +26,7 @@
 #include "bindings.hpp"
 #include "expected_caster.hpp"
 #include "flat_set_caster.hpp"
+#include "path_caster.hpp"
 #include "weakening_map_bind.hpp"
 
 using OldVersionPart = std::vector<mamba::specs::VersionPartAtom>;

libmambapy/src/libmambapy/bindings/utils.cpp

@@ -13,6 +13,7 @@
 #include <pybind11/stl_bind.h>
 
 #include "bind_utils.hpp"
+#include "path_caster.hpp"
 
 namespace mambapy
 {