Fix mac sdk build

Use the host platform "strip", and also expose "nm" and "otool" used for
toc.

Test: `m PRODUCT-sdk-sdk` on Mac
Change-Id: I7a6d127f479d3e563385ead46bc3a4b49b99776b
diff --git a/cc/makevars.go b/cc/makevars.go
index 8177aa8..c95bad2 100644
--- a/cc/makevars.go
+++ b/cc/makevars.go
@@ -312,14 +312,17 @@
 
 	ctx.Strict(makePrefix+"CC", gccCmd(toolchain, "gcc"))
 	ctx.Strict(makePrefix+"CXX", gccCmd(toolchain, "g++"))
-	ctx.Strict(makePrefix+"STRIP", gccCmd(toolchain, "strip"))
 
 	if target.Os == android.Darwin {
 		ctx.Strict(makePrefix+"AR", "${config.MacArPath}")
+		ctx.Strict(makePrefix+"NM", "${config.MacToolPath}/nm")
+		ctx.Strict(makePrefix+"OTOOL", "${config.MacToolPath}/otool")
+		ctx.Strict(makePrefix+"STRIP", "${config.MacStripPath}")
 	} else {
 		ctx.Strict(makePrefix+"AR", "${config.ClangBin}/llvm-ar")
 		ctx.Strict(makePrefix+"READELF", gccCmd(toolchain, "readelf"))
 		ctx.Strict(makePrefix+"NM", gccCmd(toolchain, "nm"))
+		ctx.Strict(makePrefix+"STRIP", gccCmd(toolchain, "strip"))
 	}
 
 	if target.Os == android.Windows {