build: cleanup Makefile
build: cleanup Makefile

Cleanup spaces from the Makefile.  Automake is ok with spaces, but for a
cleaner file, use tabs.

Change-Id: I2228ded60960cf0ec47950631a729d80ea0830f8
Signed-off-by: Patrick Venture <36c53fa43f47f3fd67cb2fc38031827244d18a1f@google.com>

openbmc/google-ipmi-sys