Revert "fix: move link dir to find package"

This reverts commit 115e589.

Author: henryiii

CMakeLists.txt

@@ -16,6 +16,9 @@ python_add_library(py_gd MODULE "${py_gd_c}" WITH_SOABI)
 target_link_libraries(py_gd PUBLIC GD::GD Python::NumPy)
 install(TARGETS py_gd DESTINATION py_gd)
 
+get_filename_component(GD_LIBRARY_DIR "${GD_LIBRARIES}" DIRECTORY)
+set_target_properties(py_gd PROPERTIES INSTALL_RPATH "${GD_LIBRARY_DIR}")
+
 cython_transpile(py_gd/spline.pyx LANGUAGE C OUTPUT_VARIABLE spline_c)
 python_add_library(spline MODULE "${spline_c}" WITH_SOABI)
 target_link_libraries(spline PUBLIC Python::NumPy)

cmake/FindGD.cmake

@@ -17,7 +17,6 @@ find_library(GD_LIBRARY
 
 cmake_path(ABSOLUTE_PATH GD_LIBRARY)
 cmake_path(ABSOLUTE_PATH GD_INCLUDE_DIR)
-get_filename_component(GD_LIBRARY_DIR "${GD_LIBRARIES}" DIRECTORY)
 
 message (STATUS "libgd found at ${GD_LIBRARY}, ${GD_INCLUDE_DIR}")
 
@@ -41,7 +40,6 @@ if(GD_FOUND AND NOT TARGET GD::GD)
     IMPORTED_LOCATION "${GD_LIBRARY}"
     INTERFACE_COMPILE_OPTIONS "${PC_GD_CFLAGS_OTHER}"
     INTERFACE_INCLUDE_DIRECTORIES "${GD_INCLUDE_DIR}"
-    INTERFACE_LINK_DIRECTORIES "${GD_LIBRARY_DIR}"
   )
 endif()