Fixed audio crashes at startup

[Laurent]

Hi

I've made a fix in SFML 2 that should solve most (all?) of the crashes that occur at startup when using the audio module.

I'm now waiting for feedback from users who had this problem

[OniLinkPlus]

This update has created a problem when compiling Audio:
../../extlibs/headers/sndfile.h|308|error: ‘__int64’ does not name a type|
This leads to several more errors caused by this. Any ideas on what went wrong? It only happens when compiling the Windows version, through both TDM MinGW and stable MinGW.

Fix: Delete the Build Directory and then SVN Update