Make QProcess::splitCommand() available without process feature

QProcess::splitCommand() is a static function that is used at
least by Qt for Android without needing rest of the
process-feature support (QProcess).

Declare a simple QProcess class when the process-feature is not
enabaled. This class makes the static splitCommand() function
available.

Fixes: QTBUG-135655
Change-Id: I97dc054c3007e98bd786cbe092ffc78e3cc201e5
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/qprocess.cpp

@@ -2422,6 +2422,7 @@ void QProcessPrivate::start(QIODevice::OpenMode mode)
     errorString.clear();
     startProcess();
 }
+#endif // QT_CONFIG(process)
 
 /*!
     \since 5.15
@@ -2472,6 +2473,7 @@ QStringList QProcess::splitCommand(QStringView command)
     return args;
 }
 
+#if QT_CONFIG(process)
 /*!
     \since 5.0
 

src/corelib/io/qprocess.h

@@ -291,6 +291,18 @@ private:
 Q_DECLARE_OPERATORS_FOR_FLAGS(QProcess::UnixProcessFlags)
 #endif
 
+#else // !QT_CONFIG(process)
+
+class QProcess
+{
+public:
+    Q_CORE_EXPORT static QStringList splitCommand(QStringView command);
+
+private:
+    QProcess() = delete;
+    Q_DISABLE_COPY_MOVE(QProcess)
+};
+
 #endif // QT_CONFIG(process)
 
 QT_END_NAMESPACE