xrmoptions: give a name to the union in XrmOption struct
xrmoptions: give a name to the union in XrmOption struct

fixes a compilation warning when building with -Wpedantic

jreinert/rofi,t-wissmann/rofi,stettberger/rofi,eigengrau/rofi,stettberger/rofi,daemonl/rofi,ThomasAdam/rofi,ThomasAdam/rofi,jubalh/rofi,jreinert/rofi,carnager/rofi,carnager/rofi,eigengrau/rofi,carnager/rofi,t-wissmann/rofi,jubalh/rofi,daemonl/rofi