mesa-demos demand libgles1 and userland driver does not have it, therefore make it
conditional on choice of graphics driver, remove it when using userland driver and
keep it when using vc4 graphics driver.
Signed-off-by: Khem Raj <raj.khem@gmail.com>
--as-needed exposes a dependency problem where libegl needs some symbols
from libgles2 but the order that waf uses on linker cmdline for these
libs is reversed so we end up with link time failures e.g.
libEGL.so: undefined reference to `glxx_client_GetRenderbufferParameteriv'
Signed-off-by: Khem Raj <raj.khem@gmail.com>