freeswitch: apr dep

Freeswitch requires APR to build.
Doh. Should have caught this. Fixed now.

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On 17/12/2014 14:59, Mike McQuaid wrote:
> In Library/Formula/freeswitch.rb
> <https://github.com/Homebrew/homebrew/pull/35055#discussion-diff-21976242>:
> 
>> @@ -1,10 +1,9 @@
>> -require 'formula'
>> +require "formula"
> 
> Just remove this now, cheers.
> 
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