With current name, 'make saveconfig' is broken for this sample. Also, it
is confusing to have a sample named 'nios2-elf-mingw32' while show-tuple
refers to it as 'nios2-spico-elf' and saveconfig attempts to save it
into 'i686-w64-mingw32,nios2-spico-elf'.
Signed-off-by: Alexey Neyman <stilor@att.net>
