[libnl3]: Reduce build time of libnl3. (#15536)

Fix debian files for libnl3 to enable a parallel build.

How to verify it

SONIC_CONFIG_MAKE_JOBS=20

now:
make target/debs/bullseye/libnl-3-200_3.5.0-1_amd64.deb-clean
make target/debs/bullseye/libnl-3-200_3.5.0-1_amd64.deb
grep Elapsed target/debs/bullseye/libnl-3-200_3.5.0-1_amd64.deb.log
Elapsed time: 0h 1m 51s

fixed version:
make target/debs/bullseye/libnl-3-200_3.5.0-1_amd64.deb-clean
make target/debs/bullseye/libnl-3-200_3.5.0-1_amd64.deb
grep Elapsed target/debs/bullseye/libnl-3-200_3.5.0-1_amd64.deb.log
Elapsed time: 0h 0m 22s

src/libnl3/Makefile

@@ -24,7 +24,7 @@ $(addprefix $(DEST)/, $(MAIN_TARGET)): $(DEST)/% :
 	stg init
 	stg import -s ../patch/series
 
-	ln -s ../debian debian
+	cp -r ../debian debian
 ifeq ($(CROSS_BUILD_ENVIRON), y)
 	dpkg-buildpackage -rfakeroot -b -us -uc -a$(CONFIGURED_ARCH) -Pcross,nocheck -j$(SONIC_CONFIG_MAKE_JOBS) --admindir $(SONIC_DPKG_ADMINDIR)
 else

src/libnl3/debian/compat

@@ -1 +1 @@
-9
+10

src/libnl3/debian/control

@@ -204,42 +204,3 @@ Description: development library and headers for libnl-xfrm-3
  .
  This package contains the files that are needed to build applications using
  libnl-xfrm-3.
-
-Package: libnl-3-200-dbg
-Architecture: linux-any
-Section: debug
-Depends: libnl-3-200 (= ${binary:Version}), ${misc:Depends}
-Priority: extra
-Description: debug symbols for libnl3
- This is a library for applications dealing with netlink sockets.
- The library provides an interface for raw netlink messaging and various
- netlink family specific interfaces.
- .
- This package contains unstripped shared libraries. It is provided primarily
- to provide a backtrace with names in a debugger, this makes it somewhat easier
- to interpret core dumps. The libraries are installed in /usr/lib/debug and
- are automatically used by gdb.
-
-Package: libnl-3-200-udeb
-Architecture: linux-any
-XC-Package-Type: udeb
-Section: debian-installer
-Depends: ${misc:Depends}, ${shlibs:Depends}
-Description: library for dealing with netlink sockets
- This is a library for applications dealing with netlink sockets.
- The library provides an interface for raw netlink messaging and various
- netlink family specific interfaces.
- .
- This package is a udeb. It's only useful inside of debian-installer.
-
-Package: libnl-genl-3-200-udeb
-Architecture: linux-any
-XC-Package-Type: udeb
-Section: debian-installer
-Depends: libnl-3-200-udeb (= ${binary:Version}), ${misc:Depends}, ${shlibs:Depends}
-Description: library for dealing with netlink sockets - generic netlink
- This is a library for applications dealing with netlink sockets.
- The library provides an interface for raw netlink messaging and various
- netlink family specific interfaces.
- .
- This package is a udeb. It's only useful inside of debian-installer.

src/libnl3/debian/libnl-3-200-udeb.install

@@ -1 +0,0 @@
-usr/lib/*/libnl-3.so.* lib

src/libnl3/debian/libnl-genl-3-200-udeb.install

@@ -1,2 +0,0 @@
-#!/usr/bin/dh-exec
-usr/lib/${DEB_HOST_MULTIARCH}/libnl-genl-3.so.* lib/${DEB_HOST_MULTIARCH}/

src/libnl3/debian/rules

@@ -1,39 +1,4 @@
 #!/usr/bin/make -f
 
-DEB_BUILDDIR = debian/build
+%:
-DEB_MAKE_FLAVORS = main udeb
+	dh $@
-
-udeb_libnl=libnl-3-200-udeb
-udeb_libnl_genl=libnl-genl-3-200-udeb
-
-TG_BRANCHES := debian/etc-libnl-3,debian/out-of-tree,debian/no-symvers
-
--include /usr/share/topgit/tg2quilt.mk
-
-# to export the patch series use
-#	debian/rules tg-clean
-#	debian/rules tg-export
-
-
-include /usr/share/cdbs/1/rules/debhelper.mk
-include /usr/share/cdbs/1/rules/autoreconf.mk
-include /usr/share/cdbs/1/class/autotools.mk
-
-# FIXME: not honoured
-#CFLAGS_udeb += $(CFLAGS) -Os
-CFLAGS += $(if $(findstring udeb,$(cdbs_make_curflavor)),-Os)
-
-DEB_DH_STRIP_ARGS := --dbg-package=libnl-3-200-dbg
-DEB_DH_MAKESHLIBS_ARGS_libnl-3-200 := --add-udeb=$(udeb_libnl)
-DEB_DH_MAKESHLIBS_ARGS_libnl-genl-3-200 := --add-udeb=$(udeb_libnl_genl)
-
-DEB_MAKE_DESTDIRSKEL = $(CURDIR)/debian/tmp
-DEB_MAKE_DESTDIRSKEL_udeb = $(CURDIR)/debian/tmp/udeb
-
-DEB_DH_INSTALL_ARGS_$(udeb) += --sourcedir=debian/tmp/udeb
-
-DEB_CONFIGURE_EXTRA_FLAGS += --libdir=\$${prefix}/lib/$(DEB_HOST_MULTIARCH)
-
-clean::
-	# from some unknown reason CDBS does not remove the builddir
-	rm -rf $(DEB_BUILDDIR)