Use lowercase for Windows header for supporting cross-compilation

Linux mingw uses lowercase headers, so cross-building on Linux for Windows
target must use the correct form. Windows is case-insensitive, so it won't
affect host-native builds.

Change-Id: Ic2140412bb367bbce83b5e2546d70e0936928c5c
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: David Schulz <david.schulz@qt.io>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5nodeinstanceclientproxy.cpp

@@ -41,7 +41,7 @@
 #if defined(Q_OS_UNIX)
 #include <unistd.h>
 #elif defined(Q_OS_WIN)
-#include <Windows.h>
+#include <windows.h>
 #endif
 
 namespace QmlDesigner {

share/qtcreator/qml/qmlpuppet/qml2puppet/qml2puppetmain.cpp

@@ -54,7 +54,7 @@
 #endif
 
 #ifdef Q_OS_WIN
-#include <Windows.h>
+#include <windows.h>
 #endif
 
 namespace {

src/libs/qtcreatorcdbext/pytype.cpp

@@ -31,7 +31,7 @@
 #include "stringutils.h"
 #include "symbolgroupvalue.h"
 
-#include <Windows.h>
+#include <windows.h>
 #ifndef _NO_CVCONST_H
 #define _NO_CVCONST_H
 #include <dbghelp.h>

src/libs/qtcreatorcdbext/stringutils.cpp

@@ -36,7 +36,7 @@
 #include <codecvt>
 #include <iomanip>
 
-#include <Windows.h>
+#include <windows.h>
 
 static const char whiteSpace[] = " \t\r\n";
 

src/plugins/compilationdatabaseprojectmanager/compilationdatabaseproject.cpp

@@ -54,7 +54,7 @@
 #include <QFileDialog>
 
 #ifdef Q_OS_WIN
-#include <Windows.h>
+#include <windows.h>
 #endif
 
 using namespace ProjectExplorer;

src/tools/winrtdebughelper/winrtdebughelper.cpp

@@ -23,7 +23,7 @@
 **
 ****************************************************************************/
 
-#include <Windows.h>
+#include <windows.h>
 #include <stdio.h>
 #include <stdlib.h>
 

tests/manual/cplusplus-tools/main.cpp

@@ -31,7 +31,7 @@
 #include <iostream>
 #include <vector>
 #include <cstdio>
-//#include <Windows.h>
+//#include <windows.h>
 //#include <linux/version.h>
 #include "dummy.h"
 #include "detail/header.h"