libswresample/Makefile: put each object on its own line

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libswresample/Makefile

@@ -5,6 +5,10 @@ FFLIBS = avutil
 
 HEADERS = swresample.h
 
-OBJS = swresample.o audioconvert.o resample.o rematrix.o dither.o
+OBJS = audioconvert.o                        \
+       dither.o                              \
+       rematrix.o                            \
+       resample.o                            \
+       swresample.o                          \
 
 TESTPROGS = swresample_test