Use upstream qemu.

Drop riscv-qemu, add upstream qemu, and fix one Makefile reference.

.gitmodules

@@ -13,9 +13,9 @@
 [submodule "riscv-newlib"]
 	path = riscv-newlib
 	url = ../riscv-newlib.git
-[submodule "riscv-qemu"]
-	path = riscv-qemu
-	url = ../riscv-qemu.git
 [submodule "riscv-gdb"]
 	path = riscv-gdb
 	url = ../riscv-binutils-gdb.git
+[submodule "qemu"]
+	path = qemu
+	url = https://git.qemu.org/git/qemu.git

Makefile.in

@@ -687,7 +687,7 @@ stamps/build-gcc-musl-stage2: $(srcdir)/riscv-gcc stamps/build-musl-linux \
 	mkdir -p $(dir $@) && touch $@
 
 
-stamps/build-qemu: $(srcdir)/riscv-qemu
+stamps/build-qemu: $(srcdir)/qemu
 	rm -rf $@ $(notdir $@)
 	mkdir $(notdir $@)
 	cd $(notdir $@) && $</configure \

qemu

@@ -0,0 +1 @@
+Subproject commit 57dfc2c4d51e770ed3f617e5d1456d1e2bacf3f0

riscv-qemu

@@ -1 +0,0 @@
-Subproject commit ff36f2f77ec3e6a6211c63bfe1707ec057b12f7d