We don't need the '#define SvpSalGraphics AquaSalGraphics' in
vcl/inc/headless/svpgdi.hxx. The actual AquaSalGraphics we use for iOS
is in vcl/inc/quartz/salgdi.h. I don't remember the details of the
convoluted history behind this.

Change-Id: Ie56c3c93acf7ad89e10a05e75aa4ca7fd596ba98
Reviewed-on: https://gerrit.libreoffice.org/63098
Tested-by: Jenkins
Reviewed-by: Tor Lillqvist <tml@collabora.com>