DINPUT: enforce single mouse acquire (try 2)

[Alex Villací­s Lasso]

While testing the trial of Fate/Stay Night (www.typemoon.org), I found a 
way to crash dinput: start the trial (mouse acquire, function hook), 
display the About dialog (nested mouse acquire, second instance of 
function hook, overwrites first acquire pointer... oops!), dismiss About 
dialog (current_lock <= NULL, second hook unregistered, first hook 
remains, mouse event called with current_lock == NULL ==> segmentation 
fault). This patch attempts to fix this by disallowing nested mouse 
acquires.

Changelog:
* Disallow nested mouse acquires
* Add assertion that mouse hook called should have current_lock != NULL

Alex Villacís Lasso
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