Do not link against libxtos if not needed

xtldr/modules/fb_o/CMakeLists.txt

@@ -15,7 +15,7 @@ list(APPEND XTLDR_FB_O_SOURCE
 add_executable(fb_o ${XTLDR_FB_O_SOURCE})
 
 # Add linker libraries
-target_link_libraries(fb_o libxtos libxtldr)
+target_link_libraries(fb_o libxtldr)
 
 # Set proper binary name and install target
 set_target_properties(fb_o PROPERTIES SUFFIX .efi)