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 <venture@google.com>
diff --git a/Makefile.am b/Makefile.am
index 3a33d12..ba5a539 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -9,11 +9,12 @@
 libsyscmds_LTLIBRARIES = libsyscmds.la
 libsyscmds_la_SOURCES = main.cpp cable.cpp cpld.cpp eth.cpp psu.cpp
 
-libsyscmds_la_LDFLAGS = $(SDBUSPLUS_LIBS) \
-                        $(PHOSPHOR_LOGGING_LIBS) \
-                        -lstdc++fs \
-                        -version-info 0:0:0 -shared
+libsyscmds_la_LDFLAGS = \
+	$(SDBUSPLUS_LIBS) \
+	$(PHOSPHOR_LOGGING_LIBS) \
+	-lstdc++fs \
+	-version-info 0:0:0 -shared
 
-libsyscmds_la_CXXFLAGS = $(SDBUSPLUS_CFLAGS) \
-                         $(PHOSPHOR_LOGGING_CFLAGS)
-
+libsyscmds_la_CXXFLAGS = \
+	$(SDBUSPLUS_CFLAGS) \
+	$(PHOSPHOR_LOGGING_CFLAGS)