Merge ~muktupavels/unity:fix-build into unity:master

[Alberts Muktupāvels]

Fix build after Compiz changes

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e3abf80..76ff07f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 project (unity)
-cmake_minimum_required(VERSION 2.8.9)
+cmake_minimum_required(VERSION 3.17.0)
 
 include (cmake/Documentation.cmake)
 include (cmake/pch.cmake)
diff --git a/debian/control b/debian/control
index cd3a3bf..59eabf9 100644
--- a/debian/control
+++ b/debian/control
@@ -2,7 +2,7 @@ Source: unity
 Section: gnome
 Priority: optional
 Maintainer: Ubuntu Developers <[e-mail]>
-Build-Depends: cmake,
+Build-Depends: cmake (>= 3.17.0),
                compiz-dev (>= 1:0.9.13.1+18.04.20180221),
                debhelper (>= 9.0.0~),
                dbus-test-runner,
diff --git a/plugins/unity-mt-grab-handles/src/unity-mt-grab-handles.cpp b/plugins/unity-mt-grab-handles/src/unity-mt-grab-handles.cpp
index fb78bd9..a953318 100644
--- a/plugins/unity-mt-grab-handles/src/unity-mt-grab-handles.cpp
+++ b/plugins/unity-mt-grab-handles/src/unity-mt-grab-handles.cpp
@@ -19,6 +19,8 @@
 #include "unity-mt-grab-handles.h"
 #include <iostream>
 
+using namespace boost::placeholders;
+
 COMPIZ_PLUGIN_20090315(unitymtgrabhandles, UnityMTGrabHandlesPluginVTable);
 
 unsigned int unity::MT::MaximizedHorzMask = CompWindowStateMaximizedHorzMask;