build-sys: remove slirp cflags from main-loop.o

Left over from c2d6365.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190712172743.17632-1-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

util/Makefile.objs

@@ -3,7 +3,6 @@ util-obj-y += bufferiszero.o
 util-obj-y += lockcnt.o
 util-obj-y += aiocb.o async.o aio-wait.o thread-pool.o qemu-timer.o
 util-obj-y += main-loop.o iohandler.o
-main-loop.o-cflags := $(SLIRP_CFLAGS)
 util-obj-$(call lnot,$(CONFIG_ATOMIC64)) += atomic64.o
 util-obj-$(CONFIG_POSIX) += aio-posix.o
 util-obj-$(CONFIG_POSIX) += compatfd.o