tdf#122221: Bin apparently unnecessary early return

Removing these few lines of code fixes the problem on iOS, and has no
apparent ill effect on macOS. But sure, I didn't check that thoroughly
on macOS, so in case this has a bad effect on macOS after all, need to
reinstate the few lines but make them #ifndef IOS.

(Still passes make check.)

Change-Id: I2380d010ba223a698acfe916fca4580a1502be98

vcl/quartz/salgdicommon.cxx

@@ -587,12 +587,6 @@ bool AquaSalGraphics::drawAlphaBitmap( const SalTwoRect& rTR,
                                        const SalBitmap& rSrcBitmap,
                                        const SalBitmap& rAlphaBmp )
 {
-    if (rTR.mnSrcWidth != rTR.mnDestWidth || rTR.mnSrcHeight != rTR.mnDestHeight)
-    {
-        // TODO - would be better to scale it by the native code
-        return false;
-    }
-
     // An image mask can't have a depth > 8 bits (should be 1 to 8 bits)
     if( rAlphaBmp.GetBitCount() > 8 )
         return false;