Makefile: use libsqlite3 build when possible

Dynamically link sqlite3 when installed, the main motivation is that we
reduce the podman binary size with that. I see about 2.5 MB savings.

But also dynamically linking it means if there a vulnerabilities only
the sqlite3 distro package needs updating and we don't have to make a
new podman release with the vendored update.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

Makefile

@@ -61,6 +61,7 @@ REMOTETAGS ?= remote exclude_graphdriver_btrfs containers_image_openpgp
 BUILDTAGS ?= \
 	$(shell hack/apparmor_tag.sh) \
 	$(shell hack/btrfs_installed_tag.sh) \
+	$(shell hack/sqlite_tag.sh) \
 	$(shell hack/systemd_tag.sh) \
 	$(shell hack/libsubid_tag.sh) \
 	$(if $(filter linux,$(GOOS)), seccomp,)

hack/sqlite_tag.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+${CPP:-${CC:-cc} -E} ${CPPFLAGS} - &> /dev/null << EOF
+#include <sqlite3.h>
+EOF
+if test $? -eq 0 ; then
+	echo libsqlite3
+fi