Add sys/types.h include to fix build with musl

This amends c82ed8b279.

Pick-to: 6.7
Fixes: QTBUG-120766
Change-Id: I2584c62d35c6ee0a9c8687a476f7eab52bd52af2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/qstorageinfo_linux_p.h

@@ -24,7 +24,6 @@
 #include <QtCore/private/qlocale_tools_p.h>
 
 #include <sys/sysmacros.h> // makedev()
-#include <sys/types.h> // dev_t
 
 QT_BEGIN_NAMESPACE
 

src/corelib/io/qstorageinfo_p.h

@@ -21,6 +21,10 @@
 #include <QtCore/private/qglobal_p.h>
 #include "qstorageinfo.h"
 
+#ifdef Q_OS_UNIX
+#include <sys/types.h> // dev_t
+#endif
+
 QT_BEGIN_NAMESPACE
 
 inline Q_LOGGING_CATEGORY(lcStorageInfo, "qt.core.qstorageinfo", QtWarningMsg)