Makefile: Not every shell support {}

So interpret it by hand.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

Makefile

@@ -171,7 +171,8 @@ distclean: clean
 	rm -f qemu-options.def
 	rm -f config-all-devices.mak
 	rm -f roms/seabios/config.mak roms/vgabios/config.mak
-	rm -f qemu-{doc,tech}.{info,aux,cp,dvi,fn,info,ky,log,pdf,pg,toc,tp,vr}
+	rm -f qemu-doc.info qemu-doc.aux qemu-doc.cp qemu-doc.dvi qemu-doc.fn qemu-doc.info qemu-doc.ky qemu-doc.log qemu-doc.pdf qemu-doc.pg qemu-doc.toc qemu-doc.tp qemu-doc.vr
+	rm -f qemu-tech.info qemu-tech.aux qemu-tech.cp qemu-tech.dvi qemu-tech.fn qemu-tech.info qemu-tech.ky qemu-tech.log qemu-tech.pdf qemu-tech.pg qemu-tech.toc qemu-tech.tp qemu-tech.vr
 	for d in $(TARGET_DIRS) libhw32 libhw64 libuser libdis libdis-user; do \
 	rm -rf $$d || exit 1 ; \
         done