util/pkgbuild: guard against unset variable
Allows use under 'set -u'.
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@ -18,7 +18,7 @@
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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[[ -n "$LIBMAKEPKG_UTIL_PKGBUILD_SH" ]] && return
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[[ -n "${LIBMAKEPKG_UTIL_PKGBUILD_SH:-}" ]] && return
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LIBMAKEPKG_UTIL_PKGBUILD_SH=1
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