Squashed 'files/external/vivid-planet-munin-php-apc/' changes from b5593b7..b5aa024

b5aa024 support named copies of the plugin

git-subtree-dir: files/external/vivid-planet-munin-php-apc
git-subtree-split: b5aa024cffe691555d47b2c5bd4f121d2bbd3963
Merge commit 'e8037158ecc6c027425b7921ae24df5548eee063'