apps/system/utils: Fix build error of killall command about functions in utils_proc.c
A killall command uses proc data with utils in utils_proc.c
So build utils_proc.c if a killall command is enabled.
Build error:
Undefined Symbols
U utils_proc_pid_foreach	/root/tizenrt/apps/system/utils/utils_kill.c:353
U utils_readfile	/root/tizenrt/apps/system/utils/utils_kill.c:276
@@ -165,6 +165,8 @@ else ifeq ($(CONFIG_ENABLE_STACKMONITOR),y)
CSRCS += utils_proc.c
else ifeq ($(CONFIG_ENABLE_HEAPINFO),y)
CSRCS += utils_proc.c
+else ifeq ($(CONFIG_ENABLE_KILLALL),y)
+CSRCS += utils_proc.c
endif
AOBJS = $(ASRCS:.S=$(OBJEXT))
