Fix include of std::set

With new version of gRPC, compiler complains about missing include of
the std::set. Move include from .cpp to .h files.

Pick-to: 6.6
Change-Id: Ibfef277598cb9e620ab1b693a42564706302c9cc
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>

src/tools/qtgrpcgen/qgrpcgenerator.cpp

@@ -10,7 +10,6 @@
 #include "utils.h"
 #include "options.h"
 
-#include <set>
 #include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>

src/tools/qtgrpcgen/qgrpcgenerator.h

@@ -4,8 +4,9 @@
 #ifndef QGRPCGENERATOR_H
 #define QGRPCGENERATOR_H
 
-#include <memory>
 #include "generatorbase.h"
+#include <memory>
+#include <set>
 
 namespace google::protobuf {
 class FileDescriptor;

src/tools/qtprotobufgen/qprotobufgenerator.cpp

@@ -12,11 +12,11 @@
 #include "utils.h"
 #include "options.h"
 
-#include <cassert>
 #include <array>
+#include <cassert>
 #include <numeric>
-#include <set>
 #include <unordered_set>
+
 #include <google/protobuf/stubs/logging.h>
 #include <google/protobuf/stubs/common.h>
 #include <google/protobuf/io/printer.h>

src/tools/qtprotobufgen/qprotobufgenerator.h

@@ -7,6 +7,8 @@
 
 #include "generatorbase.h"
 
+#include <set>
+
 namespace google::protobuf {
 class FileDescriptor;
 class Descriptor;