sims/external: switch clone urls in makefile to https

sims/external/rules.mk

@@ -29,7 +29,7 @@ external: $(d)gem5/ready $(d)qemu/ready $(d)ns-3/ready $(d)femu/ready
 .PHONY: external
 
 $(d)gem5:
-	git clone git@github.com:simbricks/gem5.git $@
+	git clone https://github.com/simbricks/gem5.git $@
 
 $(d)gem5/ready: $(d)gem5
 	+cd $< && scons build/X86/gem5.opt CCFLAGS="-I$(abspath $(lib_dir))" \
@@ -40,7 +40,7 @@ $(d)gem5/ready: $(d)gem5
 
 
 $(d)qemu:
-	git clone git@github.com:simbricks/qemu.git $@
+	git clone https://github.com/simbricks/qemu.git $@
 
 $(d)qemu/ready: $(d)qemu
 	+cd $< && ./configure \
@@ -61,14 +61,14 @@ $(QEMU): $(d)qemu/ready
 
 
 $(d)ns-3:
-	git clone git@github.com:simbricks/ns-3.git $@
+	git clone https://github.com/simbricks/ns-3.git $@
 
 $(d)ns-3/ready: $(d)ns-3 $(lib_netif)
 	+cd $< && COSIM_PATH=$(abspath $(base_dir)) ./cosim-build.sh configure
 	touch $@
 
 $(d)femu:
-	git clone git@github.com:simbricks/femu.git $@
+	git clone https://github.com/simbricks/femu.git $@
 
 $(d)femu/ready: $(d)femu $(lib_nicif)
 	cd $< && make EXTRA_LDFLAGS=-L$(abspath $(lib_dir))/simbricks/nicif/ \