remove explicit mention of GEODE_LINK_NIGHTLY

nightly can be autodetected based on folder structure now, so hardcoding the line in the project is generally not a good idea

CMakeLists.txt

@@ -332,7 +332,6 @@ elseif (EXISTS ${GEODE_PLATFORM_BIN_PATH})
 else()
 	message(FATAL_ERROR
 		"No valid loader binary to link to! Install pre-built binaries with `geode sdk install-binaries`, "
-		"or build Geode from source and add `set(GEODE_LINK_NIGHTLY ON)` to your CMakeLists.txt "
-		"in the line before calling add_subdirectory for Geode."
+		"or build Geode from source."
 	)
 endif()