Move descriptor.proto to google/protobuf directory where it belongs.

This fixes some interoperability problems when trying to compile
nanopb.proto for e.g. the Google's C++ library.

Update issue 104
Status: FixedInGit

generator/proto/nanopb.proto

@@ -5,7 +5,7 @@
 // These are used by nanopb to generate statically allocable structures
 // for memory-limited environments.
 
-import "descriptor.proto";
+import "google/protobuf/descriptor.proto";
 
 option java_package = "fi.kapsi.koti.jpa.nanopb";