Revert "gcc: make the ld wrapper add paths via -rpath if there's already an -rpath arg"

This reverts commit 3d12ddae.

component/gcc/buildout.cfg

@@ -42,11 +42,13 @@ post-install =
   done
   cat <<EOF >ld
   #!/bin/sh -e
-  for x; do case \$x in -rpath=*)
-    set -- "\$@" $2
-    ! break
+  case \$#:\$1 in 0:|1:-*) ;; *)
+    if [ "\$LD_RUN_PATH" ]
+    then LD_RUN_PATH=\$LD_RUN_PATH$1
+    else set -- "\$@" $2
+    fi
     ;;
-  esac; done && export LD_RUN_PATH=\$${LD_RUN_PATH:+\$LD_RUN_PATH:}$${1#:}
+  esac
   exec ${binutils:location}/bin/ld "\$@"
   EOF
   chmod +x ld