Converted spaces to tabs
Converted spaces to tabs

For some reason the tab in Makefile got replaced with spaces.
Converted them back so that make does not complain about
incorrect indentation.

Signed-off-by: Rudolf J Streif <ea7b312ba06c558b2c165670d6c670057f7928aa@gmail.com>

PDXostc/rvi_core,magnusfeuer/rvi_core,uwiger/rvi_core,PDXostc/rvi_core,magnusfeuer/rvi_core,uwiger/rvi_core,uwiger/rvi_core,PDXostc/rvi_core,magnusfeuer/rvi_core