Create symlink :uim-systray -> uim-toolbar-gtk-systray

We provide a symbolic link to the original binary file that may
help user to quickly launch the toolbar. Gtk2 is our default choice
+ patch to select default mode of generic IM

This patch allows users to select the default mode (on/off) for generic IM.
This may be buggy if some generic IM has its own settings to do the samething
Remove obsolete patch file

This patch file is useless bc. we are using the new patch with better support that
allows users to adjust the defaulte mode of generic IM
Update PKGBUILD to use new patch file