deb, rpm: fix runc using incorrect version

runc v1.1.13 introduced an option to customize the version (as printed by the
`--version` flag) through a `VERSION` Make variable / environment variable
(see [1]).

This variable collided with the `VERSION` environment variable used by
containerd for the same purpose, which lead to `runc` binaries built
using the version of containerd;

    runc --version
    runc version 1.7.20
    commit: v1.1.13-0-g58aa9203
    ...

This patch explicitly sets the `VERSION` variable to the version of
runc being built when building the binary.

[1]: opencontainers/runc@6f4d975

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

debian/rules

@@ -44,7 +44,8 @@ binaries: ## Create containerd binaries
 	rm -f bin/containerd-stress
 
 bin/runc:
-	@set -x; make -C /go/src/github.com/opencontainers/runc  --no-print-directory \
+	# Unset the VERSION variable as it's meant for containerd's version, not runc.
+	@set -x; env -u VERSION make -C /go/src/github.com/opencontainers/runc  --no-print-directory \
 		BINDIR="$$(pwd)/bin" \
 		runc install
 

rpm/containerd.spec

@@ -117,7 +117,8 @@ rm -f bin/containerd-stress
 bin/containerd --version
 bin/ctr --version
 
-make -C /go/src/github.com/opencontainers/runc BINDIR=%{_builddir}/bin runc install
+# Unset the VERSION variable as it's meant for containerd's version, not runc.
+env -u VERSION make -C /go/src/github.com/opencontainers/runc BINDIR=%{_builddir}/bin runc install
 
 
 %install