Move jdwpspy into C++ now that jdwp itself is in C++.

git cherry-pick --no-commit  73cfba122a4ae1c6162fe1c5112e77d8c8430dd9

Change-Id: Id0c6188ece19f6eade18ba8725384d94465aa197
diff --git a/tools/jdwpspy/find_JdwpConstants.cpp b/tools/jdwpspy/find_JdwpConstants.cpp
new file mode 100644
index 0000000..57b7dbb
--- /dev/null
+++ b/tools/jdwpspy/find_JdwpConstants.cpp
@@ -0,0 +1 @@
+#include "jdwp/JdwpConstants.cpp"