GdbController cannot recognize window short path of gdb executable

**Describe the bug**
When gdb executable is short format like this:
`C:/PROGRA~2/GNUARM~1/102021~1.10/bin/AR470E~1.EXE`

Full path: "C:\PROGRA~2\GNUARM~1\102021~1.10\bin\arm-none-eabi-gdb.exe"

Then the consrtuctor will raise error: `gdb executable could not be resolved from`

Checked the code, function `distutils.spawn.find_executable()` will return None for `C:/PROGRA~2/GNUARM~1/102021~1.10/bin/AR470E~1.EXE`

**To Reproduce**

```
gdb = GdbController(`C:/PROGRA~2/GNUARM~1/102021~1.10/bin/AR470E~1.EXE`)
```