src: Use gnu C and C++ standards as default for C and C++ SourceGroupSettings on Linux platform (issue #748)

src/lib/settings/source_group/component/cxx/SourceGroupSettingsWithCStandard.cpp

@@ -4,7 +4,11 @@
 
 std::wstring SourceGroupSettingsWithCStandard::getDefaultCStandardStatic()
 {
+#ifdef __linux__
+	return L"gnu11"
+#else
 	return L"c11";
+#endif
 }
 
 std::wstring SourceGroupSettingsWithCStandard::getCStandard() const

src/lib/settings/source_group/component/cxx/SourceGroupSettingsWithCppStandard.cpp

@@ -4,7 +4,11 @@
 
 std::wstring SourceGroupSettingsWithCppStandard::getDefaultCppStandardStatic()
 {
+#ifdef __linux__
+	return L"gnu++17"
+#else
 	return L"c++17";
+#endif
 }
 
 std::wstring SourceGroupSettingsWithCppStandard::getCppStandard() const