Added php implementation of fnmatch for platforms not supporting it.

[jgmdev]

So I have spend some time playing around with Samsung Dex and configuring my phone as a development machine that is portable and power efficient. Found about this project in the process of discovering the best auto completion method that would work properly on vim on android. But couldn't build the phpctags phar file because it seems that the androind platform or the php build that is shipped with termux app repository doesn't supports fnmatch.

Took the fnmatch php implementation from the php.net comments section and added a link on the comments of the source. Sorry if I messed the formatting a bit, but I just ran a default configuration of php-cs-fixer after having to remove lots of characters that where causing errors do to copy pasting from php.net site to the Termux android app which seems to not have proper copy/pasting support.