Make both versions of _cairo_lround consistent again

Commit c000824 made cairo use libm's lround instead of its own _cairo_lround
by default. However, since commit ce58f87 from 2006, _cairo_lround does
arithmetic rounding instead of away-from-zero rounding (before said commit, it
was using baker's rounding).

So to make the rounding of _cairo_lround be independent from
DISABLE_SOME_FLOATING_POINT, we have to use another function. Turns out that
_cairo_round already does the same thing that _cairo_lround does. Their only
difference is the return type.

Signed-off-by: Uli Schlachter <psychon@znc.in>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

src/cairoint.h

@@ -968,7 +968,11 @@ _cairo_round (double r)
 cairo_private int
 _cairo_lround (double d) cairo_const;
 #else
-#define _cairo_lround lround
+static inline int cairo_const
+_cairo_lround (double r)
+{
+    return _cairo_round (r);
+}
 #endif
 
 cairo_private uint16_t