[Nice] Fixing libnice compile with GLib 2.31

[Rohan Garg]

Hi
Since GLib 2.31 and above, GStaticRecMutex has been deperecated thus causing 
builds to fail on Ubuntu Precise which now ships with the latest GLib.

The attached patch fixes the issue.

Note: No initialization of GRecMutex is required as per docs because it is 
static.

Best
Rohan Garg
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