Set correct rpath in shared library.

This could allow the package to be loaded even without the manual library.dynam() in R.

Author: jeroen

src/Makevars.in

@@ -97,7 +97,7 @@ endif
 
 # When TBB_LIB is unset on MacOS, link to the bundled version (#206)
 ifeq ($(USE_TBB)$(TBB_LIB),Mac)
-	PKG_LIBS += -Ltbb/build/lib_release -ltbb -ltbbmalloc
+	PKG_LIBS += -Ltbb/build/lib_release -ltbb -Wl,-rpath,'@loader_path/../lib'
 endif
 
 # For Solaris detect if this is 32-bit R on x86 and if so forward that to TBB