Makefile: use $(INSTALL_LIB) for modules not $(INSTALL_PROG)

We have $(INSTALL_LIB) which is the same as $(INSTALL_PROG) but
uses correct permissions.  Loadable objects (modules) are like
shared libraries, not like programs.
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>
Cc: Fam Zheng <famz@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Makefile

@@ -381,7 +381,7 @@ ifneq ($(CONFIG_MODULES),)
 	$(INSTALL_DIR) "$(DESTDIR)$(qemu_moddir)"
 	for s in $(modules-m:.mo=$(DSOSUF)); do \
 		t="$(DESTDIR)$(qemu_moddir)/$$(echo $$s | tr / -)"; \
-		$(INSTALL_PROG) $$s "$$t"; \
+		$(INSTALL_LIB) $$s "$$t"; \
 		test -z "$(STRIP)" || $(STRIP) "$$t"; \
 	done
 endif