main/multipath-tools: bump pkgrel to prevent BAD signatures

This packaged was upgraded, downgraded, and back upgraded to 0.11.0.
Since the pkgrel wasn't bumped and the former and latter 0.11.0 are
conflicting version numbers for a rebuilt package you'll get BAD
signatures.

main/multipath-tools/APKBUILD

 # Maintainer: Leonardo Arena <rnalrd@alpinelinux.org>
 pkgname=multipath-tools
 pkgver=0.11.0
-pkgrel=0
+pkgrel=1
 pkgdesc="Device Mapper Multipathing Driver"
 url="http://christophe.varoqui.free.fr/"
 arch="all"