Fixes for Linux no unity builds

Signed-off-by: Esteban Papp <81431996+amznestebanpapp@users.noreply.github.com>

Code/Framework/AzToolsFramework/AzToolsFramework/ToolsFileUtils/ToolsFileUtils_generic.cpp

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) Contributors to the Open 3D Engine Project.
+ * For complete copyright and license terms please see the LICENSE at the root of this distribution.
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ *
+ */
+
+#include "ToolsFileUtils.h"
+#include <sys/stat.h>
+#include <utime.h>
+
+#include <QStorageInfo>
+
+namespace AzToolsFramework
+{
+    namespace ToolsFileUtils
+    {
+        bool SetModificationTime(const char* const filename, AZ::u64 modificationTime)
+        {
+            struct stat statResult;
+            if (stat(filename, &statResult) != 0)
+            {
+                return false;
+            }
+
+            struct utimbuf puttime;
+            puttime.modtime = modificationTime;
+            puttime.actime = static_cast<AZ::u64>(statResult.st_ctime);
+
+            if (utime(filename, &puttime) == 0)
+            {
+                return true;
+            }
+
+            return false;
+        }
+
+        bool GetFreeDiskSpace(const QString& path, qint64& outFreeDiskSpace)
+        {
+            QStorageInfo storageInfo(path);
+            outFreeDiskSpace = storageInfo.bytesFree();
+
+            return outFreeDiskSpace >= 0;
+        }
+    }
+}

Code/Framework/AzToolsFramework/AzToolsFramework/UI/PropertyEditor/PropertyColorCtrl.cpp

@@ -18,7 +18,7 @@ AZ_PUSH_DISABLE_WARNING(4251, "-Wunknown-warning-option")
 #include <QPainter> 
 AZ_POP_DISABLE_WARNING
 #include <QtWidgets/QToolButton>
-#include <QtGUI/QRegExpValidator>
+#include <QtGui/QRegExpValidator>
 
 namespace AzToolsFramework
 {

Code/Framework/AzToolsFramework/AzToolsFramework/aztoolsframework_linux_files.cmake

@@ -29,4 +29,5 @@ set(FILES
     UI/UICore/SaveChangesDialog.hxx
     UI/UICore/SaveChangesDialog.cpp
     UI/UICore/SaveChangesDialog.ui
+    ToolsFileUtils/ToolsFileUtils_generic.cpp
 )

Code/Framework/AzToolsFramework/AzToolsFramework/aztoolsframework_mac_files.cmake

@@ -29,4 +29,5 @@ set(FILES
     UI/UICore/SaveChangesDialog.hxx
     UI/UICore/SaveChangesDialog.cpp
     UI/UICore/SaveChangesDialog.ui
+    ToolsFileUtils/ToolsFileUtils_generic.cpp
 )