package/mesa3d-demos: remove duplicate osmesa option

--disable-osmesa option is unconditionally added to CONF_OPTS even if
--enable-osmesa is used latter.

Signed-off-by: Audrey Motheron <audrey.motheron@gmail.com>
Reviewed-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/mesa3d-demos/mesa3d-demos.mk

@@ -12,7 +12,6 @@ MESA3D_DEMOS_DEPENDENCIES = host-pkgconf
 MESA3D_DEMOS_LICENSE = MIT
 
 MESA3D_DEMOS_CONF_OPTS += \
-	--disable-osmesa \
 	--disable-gles1
 
 ifeq ($(BR2_PACKAGE_XORG7)$(BR2_PACKAGE_HAS_LIBGL),yy)