[sdk] Add packaging tool (pm) to the Fuchsia SDK builder script.

Adding the tool to the SDK will allow Chrome build processes
to produce Fuchsia packages.

Change-Id: Ib897839a16ad5ad33257729abcd4fab99778fee4
diff --git a/makesdk.go b/makesdk.go
index b7bbba9..c2ada49 100644
--- a/makesdk.go
+++ b/makesdk.go
@@ -115,6 +115,11 @@
 			"tools",
 		},
 		{
+			tools,
+			x86Builddir + "host_x64/pm",
+			"tools/pm",
+		},
+		{
 			toolchain,
 			fmt.Sprintf("buildtools/%s-%s/clang", hostOs, hostCpu),
 			"clang",