[build] Migrate libyang2 sources download from wget to dget (#13394)

According to its manual page,
"[dget in its] first form, [..] fetches the requested URLs.
If this is a .dsc or .changes file, then dget acts as a source-package
 aware form of wget: it also fetches any files referenced in the
.dsc/.changes file.
The downloaded source is then checked with dscverify and,
if successful, unpacked by dpkg-source."

Thus, when possible, dget use is preferable to wget so that sources
authenticity can be performed automatically by dscverify"

Signed-off-by: Guillaume Lambert <[email protected]>

src/libyang2/Makefile

@@ -2,16 +2,6 @@
 SHELL = /bin/bash
 .SHELLFLAGS += -e
 
-LIBYANG_URL = https://sonicstorage.blob.core.windows.net/debian/pool/main/liby/libyang
-
-DSC_FILE = libyang2_$(LIBYANG2_FULLVERSION).dsc
-ORIG_FILE = libyang2_$(LIBYANG2_VERSION).orig.tar.gz
-DEBIAN_FILE = libyang2_$(LIBYANG2_FULLVERSION).debian.tar.xz
-
-DSC_FILE_URL = $(LIBYANG_URL)/$(DSC_FILE)
-ORIG_FILE_URL = $(LIBYANG_URL)/$(ORIG_FILE)
-DEBIAN_FILE_URL = $(LIBYANG_URL)/$(DEBIAN_FILE)
-
 MAIN_TARGET = $(LIBYANG2)
 DERIVED_TARGETS = $(LIBYANG2_DEV) $(LIBYANG2_DBG) $(LIBYANG2_TOOLS) $(LIBYANG2_TOOLS_DBG)
 
@@ -20,10 +10,7 @@ $(addprefix $(DEST)/, $(MAIN_TARGET)): $(DEST)/% :
 	rm -fr ./libyang2-$(LIBYANG2_VERSION)
 
 	# download debian libyang
-	wget -NO "$(DSC_FILE)" $(DSC_FILE_URL)
-	wget -NO "$(ORIG_FILE)" $(ORIG_FILE_URL)
-	wget -NO "$(DEBIAN_FILE)" $(DEBIAN_FILE_URL)
-	dpkg-source -x libyang2_$(LIBYANG2_FULLVERSION).dsc
+	dget https://deb.debian.org/debian/pool/main/liby/libyang2/libyang2_$(LIBYANG2_FULLVERSION).dsc
 
 	pushd libyang2-$(LIBYANG2_VERSION)
 	#sed -i 's/set(LIBYANG_MAJOR_SOVERSION 1)/set(LIBYANG_MAJOR_SOVERSION 2)/' CMakeLists.txt