UI: Disable QSV for simple mode on Linux

Linux QSV drivers have varying capabilities depending on if the
free/non-free Intel drivers are installed. This means we cannot safely
expose QSV in simple mode as users may be unable stream without changing
to advanced mode.

UI/window-basic-main-profiles.cpp

@@ -839,10 +839,12 @@ void OBSBasic::CheckForSimpleModeX264Fallback()
 	while (obs_enum_encoder_types(idx++, &id)) {
 		if (strcmp(id, "amd_amf_h264") == 0)
 			amd_supported = true;
+#ifdef _WIN32
 		else if (strcmp(id, "obs_qsv11") == 0)
 			qsv_supported = true;
 		else if (strcmp(id, "obs_qsv11_av1") == 0)
 			qsv_av1_supported = true;
+#endif
 		else if (strcmp(id, "ffmpeg_nvenc") == 0)
 			nve_supported = true;
 #ifdef ENABLE_HEVC

UI/window-basic-settings-stream.cpp

@@ -1652,6 +1652,7 @@ void OBSBasicSettings::ResetEncoders(bool streamOnly)
 
 	ui->simpleOutStrEncoder->addItem(ENCODER_STR("Software"),
 					 QString(SIMPLE_ENCODER_X264));
+#ifdef _WIN32
 	if (service_supports_encoder(vcodecs, "obs_qsv11"))
 		ui->simpleOutStrEncoder->addItem(
 			ENCODER_STR("Hardware.QSV.H264"),
@@ -1660,6 +1661,7 @@ void OBSBasicSettings::ResetEncoders(bool streamOnly)
 		ui->simpleOutStrEncoder->addItem(
 			ENCODER_STR("Hardware.QSV.AV1"),
 			QString(SIMPLE_ENCODER_QSV_AV1));
+#endif
 	if (service_supports_encoder(vcodecs, "ffmpeg_nvenc"))
 		ui->simpleOutStrEncoder->addItem(
 			ENCODER_STR("Hardware.NVENC.H264"),