makechrootpkg: fix repack

repack is defined as a boolean. set it true when -R is passed

/usr/sbin/makechrootpkg: line 295: 1: command not found

Signed-off-by: Ionut Biru <ibiru@archlinux.org>
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

makechrootpkg.in

@@ -87,7 +87,7 @@ makepkg_args="$makepkg_args ${*:$OPTIND}"
 # See if -R was passed to makepkg
 for arg in ${*:$OPTIND}; do
 	if [[ $arg = -R ]]; then
-		repack=1
+		repack=true
 		break
 	fi
 done