Add initial perl-ppi PKBUILD
Update perl-ppi PKGBUILD (from user dracorp). Fix build()

* Fix an error found in build() function
==> Starting build()...
/tmp/yaourt-tmp-piecia/aur-perl-ppi/./PKGBUILD: line 25: cd: /PPI-1.215:
No such file or directory
==> ERROR: A failure occurred in build().