android: define cpp_rtti=false because libLLVM is built w/o RTTI (v2)

android: define cpp_rtti=false because libLLVM is built w/o RTTI (v2)

libLLVM for Android is built without RTTI, but after commit ad86267
mesa inherits meson default RTTI enabled state.

cpp_rtti=false is added to meson options in android/mesa3d_cross.mk

(v2) Add Fixes tag and use spaces instead of tabs for aligning the trailing \

Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Fixes: ad862674 ("meson: Don't override built-in cpp_rtti option, error if it's invalid")
Cc: "21.3" "21.2" mesa-stable
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13901>