Fix missing teensy path

util/activate_msys2.sh

@@ -7,6 +7,7 @@ function export_variables {
     export PATH=$PATH:$util_dir/flip/bin
     export PATH=$PATH:$util_dir/avr8-gnu-toolchain/bin
     export PATH=$PATH:$util_dir/gcc-arm-none-eabi/bin
+    export PATH=$PATH:$util_dir/teensy_loader_cli.exe
 }
 
 export_variables