adding Arch build files

PKGBUILD

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+# Maintainer: Troy Engel <troyengel+arch@gmail.com>
+
+pkgname=petrified
+pkgver=1.0
+pkgrel=1
+pkgdesc="Bash client to update dynamic DNS at freedns.afraid.org"
+arch=('any')
+url="https://github.com/troyengel/petrified"
+license=('GPL3')
+options=('emptydirs')
+depends=('util-linux' 'coreutils' 'bash' 'iproute2' 'curl')
+install=petrified.archinst
+backup=('etc/petrified.conf')
+source=('petrified'
+        'petrified.conf'
+        'petrified.crontab'
+        'petrified.dispatch'
+        'petrified.logrotate'
+        'README.md'
+        'LICENSE')
+md5sums=('019946e82cb8be1b1073fa8f4016bf02'
+         'f011bccfc9ef01a7e27a8d79f8e8d0bd'
+         '96748831c58c8b64e786a9f7386db22e'
+         '01d6dd718325644c3bfbc89030d66a21'
+         '66aff4c7c44404f32315abdab0a479bc'
+         '56ab643013bdea713f0e67a095e77b56'
+         'd32239bcb673463ab874e80d47fae504')
+
+package() {
+  install -dm0755 "${pkgdir}/usr/bin"
+  install -m0755 petrified "${pkgdir}/usr/bin/"
+  install -dm0755 "${pkgdir}/etc"
+  install -m0640 petrified.conf "${pkgdir}/etc/" 
+  install -dm0755 "${pkgdir}/var/cache/petrified"
+
+  install -dm0755 "${pkgdir}/usr/share/doc/${pkgname}"
+  install -m0644 petrified.crontab petrified.dispatch petrified.logrotate \
+                 README.md "${pkgdir}/usr/share/doc/${pkgname}"
+}
+

petrified.archinst

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+
+pre_remove() {
+  rm -f /var/cache/petrified/lastip.dat 2>/dev/null
+}
+