Add for if user has custom sketchbook directory

[joeybab3]

As requested in #439 even if it is a rare occurrence that the user will have a custom sketchbook directory.

[me-no-dev]

Cool! Thanks!

[W4KRL]

Arduino: 1.8.5 (Windows 10), Board: "WEMOS LOLIN32, 80MHz, 921600"

I am using Arduino IDE 1.8.5 on Windows 10 64-bit. My sketch folder is C:\Users\Karl\OneDrive\Arduino

The \hardware\espressif folder appears in my sketch folder. Also copied it to C:\Program Files (86) and arduino15 folders. Ran get.exe from each of these folders.

IDE says:

C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Karl\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\Karl\OneDrive\Arduino\libraries -fqbn=espressif:esp32:lolin32:FlashFreq=80,UploadSpeed=921600 -ide-version=10805 -build-path C:\Users\Karl\AppData\Local\Temp\arduino_build_738953 -warnings=all -build-cache C:\Users\Karl\AppData\Local\Temp\arduino_cache_812265 -prefs=build.warn_data_percentage=75 -verbose C:\Users\Karl\OneDrive\Arduino\hardware\espressif\esp32\libraries\ESP32\examples\ChipID\GetChipID\GetChipID.ino
readlink C:\Users\Karl\OneDrive\Arduino\hardware: The system cannot find the file specified.

Error compiling for board WEMOS LOLIN32.