QCommandLineOption: Q_DECL_NOTHROW -> Q_DECL_NOEXCEPT

In IsInvalidName::operator(), marked as _NOTHROW, we're calling qWarning(),
which, of course, _can_ throw. We don't care in that case, but then we
musn't use _NOTHROW, which causes UB on MSVC, but _NOEXCEPT, which causes
std::terminate to be called.

Change-Id: I18f74546ea3b388495fdb173d3abd9a162fb78a9
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qcommandlineoption.cpp

@@ -250,7 +250,7 @@ namespace {
         typedef bool result_type;
         typedef QString argument_type;
 
-        result_type operator()(const QString &name) const Q_DECL_NOTHROW
+        result_type operator()(const QString &name) const Q_DECL_NOEXCEPT
         {
             if (name.isEmpty()) {
                 qWarning("QCommandLineOption: Option names cannot be empty");