add STRIP and LIPO as AvailableOptions

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@133481 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/make/options.mk b/make/options.mk
index f6a331b..f695fc8 100644
--- a/make/options.mk
+++ b/make/options.mk
@@ -31,3 +31,6 @@
 RANLIB := ranlib
 # FIXME: Remove these pipes once ranlib errors are fixed.
 RANLIBFLAGS := 2> /dev/null
+
+STRIP := strip
+LIPO := lipo