Set relative rpath for libbz2support

Author: fangerer

graalpython/com.oracle.graal.python.cext/setup.py

@@ -477,7 +477,8 @@ def build(capi_home):
         build_nativelibsupport(capi_home, 
                                 subdir="bz2", 
                                 libname="libbz2support", 
-                                deps=[Bzip2Depedency("bz2", "bzip2==1.0.8", "BZIP2")])
+                                deps=[Bzip2Depedency("bz2", "bzip2==1.0.8", "BZIP2")],
+                                extra_link_args=["-Wl,-rpath,%s/lib/%s/" % (relative_rpath, SOABI)])
         build_libpython(capi_home)
         build_builtin_exts(capi_home)
     finally: