DEBIAN_VERSION missing in gdrcopy 2.4.4

[bellabaiyunyu]

In the recent release of gdrcopy 2.4.4, DEBIAN_VERSION was removed from the FULL_VERSION variable (see https://github.com/NVIDIA/gdrcopy/blob/R2.4/packages/build-deb-packages.sh#L105), causing ./build-deb-packages.sh to fail on debian OSes.

Building libgdrapi package ...
+ cd /tmp/gdr.eKmOKY/libgdrapi-2.4.4
+ debuild --set-envvar=PKG_CONFIG_PATH= -us -uc
 dpkg-buildpackage -us -uc -ui
dpkg-buildpackage: info: source package libgdrapi
dpkg-buildpackage: info: source version 2.4.4
dpkg-buildpackage: info: source distribution stable
dpkg-buildpackage: info: source changed by Pak Markthub <pmarkthub@nvidia.com>
 dpkg-source --before-build .
dpkg-buildpackage: info: host architecture amd64
 debian/rules clean
dh clean
dh: warning: Compatibility levels before 10 are deprecated (level 9 in use)
   dh_auto_clean
dh_auto_clean: warning: Compatibility levels before 10 are deprecated (level 9 in use)
    make -j1 clean
make[1]: Entering directory '/tmp/gdr.eKmOKY/libgdrapi-2.4.4'
cd tests && \
make clean
make[2]: Entering directory '/tmp/gdr.eKmOKY/libgdrapi-2.4.4/tests'
rm -f *.o gdrcopy_copybw gdrcopy_sanity gdrcopy_copylat gdrcopy_apiperf gdrcopy_pplat *~ core.* testsuites/*.o
make[2]: Leaving directory '/tmp/gdr.eKmOKY/libgdrapi-2.4.4/tests'
cd src && \
make clean
make[2]: Entering directory '/tmp/gdr.eKmOKY/libgdrapi-2.4.4/src'
rm -f *.o  lib*.so* *~ core.*
make[2]: Leaving directory '/tmp/gdr.eKmOKY/libgdrapi-2.4.4/src'
cd src/gdrdrv && \
make clean
make[2]: Entering directory '/tmp/gdr.eKmOKY/libgdrapi-2.4.4/src/gdrdrv'
rm -rf *.o .*.o.d *.ko* *.mod.* .*.cmd Module.symvers modules.order .tmp_versions/ *~ core .depend TAGS .cache.mk  *.mod
make[2]: /tmp/gdr.eKmOKY/libgdrapi-2.4.4/src/gdrdrv/../../scripts/test_gdrdrv_HAVE_VM_FLAGS_SET.sh: No such file or directory
make[2]: Leaving directory '/tmp/gdr.eKmOKY/libgdrapi-2.4.4/src/gdrdrv'
make[1]: Leaving directory '/tmp/gdr.eKmOKY/libgdrapi-2.4.4'
   dh_clean
dh_clean: warning: Compatibility levels before 10 are deprecated (level 9 in use)
 dpkg-source -b .
dpkg-source: error: can't build with source format '3.0 (quilt)': non-native package version does not contain a revision

This issue occurred after we upgrade to gdrcopy 2.4.4 from gdrcopy 2.4. Gdrcopy 2.4's build-deb-packages.sh properly contains DEBIAN_VERSION in FULL_VERSION variable. See https://github.com/NVIDIA/gdrcopy/blob/master/packages/build-deb-packages.sh#L104.