Makefile: Switch from git:// got https://

The unauthenticated git protocol on port 9418 is no longer supported.
https://github.blog/2021-09-01-improving-git-protocol-security-github/

Makefile

@@ -93,15 +93,15 @@ git:
 
 ## Clone repositories. The other option is by variable something like BRNACH_poky, REPO_poky
 git/poky: | git
-	$(V)cd git && git clone --branch=$(GIT_BRANCH_POKY) --depth=1 git://git.yoctoproject.org/poky
+	$(V)cd git && git clone --branch=$(GIT_BRANCH_POKY) --depth=1 https://git.yoctoproject.org/poky
 git/meta-sysmocom-bsp: | git
 	cd git && git clone --branch=$(GIT_BRANCH_SYSMOCOM_BSP) https://gitea.sysmocom.de/sysmo-bts/meta-sysmocom-bsp
 git/meta-telephony: | git
-	cd git && git clone --branch=$(GIT_BRANCH_TELEPHONY) git://git.osmocom.org/meta-telephony
+	cd git && git clone --branch=$(GIT_BRANCH_TELEPHONY) https://git.osmocom.org/meta-telephony
 git/meta-smalltalk: | git
-	cd git && git clone --branch=$(GIT_BRANCH_SMALLTALK) git://github.com/sysmocom/meta-smalltalk
+	cd git && git clone --branch=$(GIT_BRANCH_SMALLTALK) https://github.com/sysmocom/meta-smalltalk
 git/meta-qt5: | git
-	cd git && git clone --branch=$(GIT_BRANCH_QT5) git://github.com/sysmocom/meta-qt5
+	cd git && git clone --branch=$(GIT_BRANCH_QT5) https://github.com/sysmocom/meta-qt5
 
 ## Create a build directory, e.g. build.sysmobts
 ## Use Poky to set-up the directory and then customize it. Copy files