Removed explicit usage of the 'register' keyword.

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

bibletime/backend/btstringmgr.cpp

@@ -54,7 +54,7 @@ bool BTStringMgr::supportsUnicode() const {
 
 const bool BTStringMgr::isUtf8(const char *buf) const {
 	int i, n;
-	register unsigned char c;
+	unsigned char c;
 	bool gotone = false;
 
 	#define F 0   /* character never appears in text */