Makefile: split up long OBJECTS line

Split up the long OBJECTS line into multiple lines using the "+="
assignment we commonly use elsewhere in the Makefile when these lines
get unwieldy.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -583,6 +583,7 @@ EXTRA_CPPFLAGS =
 FUZZ_OBJS =
 FUZZ_PROGRAMS =
 LIB_OBJS =
+OBJECTS =
 PROGRAM_OBJS =
 PROGRAMS =
 EXCLUDED_PROGRAMS =
@@ -2386,11 +2387,15 @@ XDIFF_OBJS += xdiff/xprepare.o
 XDIFF_OBJS += xdiff/xutils.o
 
 TEST_OBJS := $(patsubst %$X,%.o,$(TEST_PROGRAMS)) $(patsubst %,t/helper/%,$(TEST_BUILTINS_OBJS))
-OBJECTS := $(LIB_OBJS) $(BUILTIN_OBJS) $(PROGRAM_OBJS) $(TEST_OBJS) \
-	$(XDIFF_OBJS) \
-	$(FUZZ_OBJS) \
-	common-main.o \
-	git.o
+
+OBJECTS += $(LIB_OBJS)
+OBJECTS += $(BUILTIN_OBJS)
+OBJECTS += $(PROGRAM_OBJS)
+OBJECTS += $(TEST_OBJS)
+OBJECTS += $(XDIFF_OBJS)
+OBJECTS += $(FUZZ_OBJS)
+OBJECTS += common-main.o
+OBJECTS += git.o
 ifndef NO_CURL
 	OBJECTS += http.o http-walker.o remote-curl.o
 endif