Suppress QOpenGLShaderProgram::link() warnings for binaries

No need to pollute the debug output when attempting to load a program
binary which then gets rejected, because this is not fatal. We will
simply recompile from source then.

Change-Id: I762b7c66fc1ccdf8ab73d720ee10a349c287628b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

src/gui/opengl/qopenglshaderprogram.cpp

@@ -1310,7 +1310,7 @@ bool QOpenGLShaderProgram::link()
         GLint len;
         d->glfuncs->glGetProgramInfoLog(program, value, &len, logbuf);
         d->log = QString::fromLatin1(logbuf);
-        if (!d->linked) {
+        if (!d->linked && !d->linkBinaryRecursion) {
             QString name = objectName();
             if (name.isEmpty())
                 qWarning("QOpenGLShader::link: %ls", qUtf16Printable(d->log));