Added libstdc++ to the appimage

AppDirTemplate/macaon.desktop

 [Desktop Entry]
 Terminal=true
-Categories=Utility
+Categories=Utility;
 Icon=macaon
 Name=macaon
 Type=Application

buildAppImage.sh

 #! /bin/bash
 
-rm -rf AppDir && cp -r ../AppDirTemplate AppDir && cmake .. -DCMAKE_INSTALL_PREFIX=/usr && make -j && make install DESTDIR=AppDir && linuxdeploy --appdir AppDir -d AppDir/macaon.desktop -i AppDir/macaon.svg --output appimage 
+rm -rf AppDir && cp -r ../AppDirTemplate AppDir && cmake .. -DCMAKE_INSTALL_PREFIX=/usr && make -j && make install DESTDIR=AppDir && linuxdeploy --appdir AppDir -d AppDir/macaon.desktop -i AppDir/macaon.svg --output appimage -l $(ldd AppDir/usr/bin/macaon | grep "stdc++" | awk '{print $3}')