build: tools: remove unnecessary line breaks
build: tools: remove unnecessary line breaks

There are only two source files in the list so don't break the line
too eagerly.

Signed-off-by: Bartosz Golaszewski <108de5fbc428215dc26df4468b48691526611148@gmail.com>

brgl/libgpiod,brgl/libgpiod,brgl/libgpiod,brgl/libgpiod