Remove hardcoded INSTALL_NAME_DIR.


--- src/CMakeLists.txt.orig	2024-06-07 18:22:12
+++ src/CMakeLists.txt	2024-07-29 12:34:58
@@ -247,12 +247,6 @@
   target_compile_definitions(spatialindex PRIVATE -DHAVE_BCOPY=1)
 endif()
 
-
-if(APPLE)
-  set(MACOSX_RPATH ON)
-  set_target_properties(spatialindex spatialindex_c
-                        PROPERTIES INSTALL_NAME_DIR "@rpath")
-endif()
 
 ###############################################################################
 # Targets installation