Add support for FreeBSD --rpath linker option; this is equivalent to

freddrake · freddrake · commit 091ec2cfdd5b · 2000-08-11T13:58:37.000Z
-R on Solaris and -rpath on IRIX. This closes SourceForge bug #110613 (Jitterbug PR#202), reported by <aa8vb@yahoo.com>.
diff --git a/Modules/makesetup b/Modules/makesetup
@@ -143,6 +143,7 @@ sed -e 's/[ 	]*#.*//' -e '/^[ 	]*$/d' |
 			-[IDUCf]*)	cpps="$cpps $arg";;
 			-Xlinker)	libs="$libs $arg"; skip=libs;;
 			-rpath)		libs="$libs $arg"; skip=libs;;
+			--rpath)	libs="$libs $arg"; skip=libs;;
 			-[A-Zl]*)	libs="$libs $arg";;
 			*.a)		libs="$libs $arg";;
 			*.so)		libs="$libs $arg";;
