Fixes build error due to spaces in path to nm.exe.
Fixes build error due to spaces in path to nm.exe.

etk29321/firmware,glibersat/firmware,glibersat/firmware,BrewPi/firmware,BrewPi/firmware,glibersat/firmware,glibersat/firmware,etk29321/firmware,etk29321/firmware,glibersat/firmware,glibersat/firmware,BrewPi/firmware,BrewPi/firmware,glibersat/firmware,etk29321/firmware,BrewPi/firmware,etk29321/firmware,etk29321/firmware,BrewPi/firmware,BrewPi/firmware,BrewPi/firmware