In commit 41e83b243c (meson: remove dri-search-path, 2024-09-18) the
`dri-search-path` meson option was removed but its usage in the Android
build files was left there, resulting in the following error when
building for Android:
-----------------------------------------------------------------------
FAILED: out/target/product/vsoc_x86_64/obj_x86/MESON_MESA3D/.build.timestamp
...
meson.build:4:0: ERROR: Unknown options: "dri-search-path"
-----------------------------------------------------------------------
Remove the usage of the option when building for Android, and while at
it remove also any mention of if in docs/drivers/llvmpipe.rst
Remove also the MESA3D_LIB_DIR variable which was used only for
dri-search-path.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31266>
cebaa64ee3