tools/meson: add pending patch to improve binary reproducibility

tools/meson: add pending patch to improve binary reproducibility

Add 3 pending patch that improve binary reproducibility. The first
address a problem with RPATH string not getting cleared on removal of
RPATH entry from ELF section. The other 2 skip including external shared
library in RPATH in meson build phase.

This follows the logic that on cross-compiling we can't run the binary
anyway as it does target a different arch hence it doesn't make sense to
include those extra path in RPATH causing reproducibility problems (as
path for those external library will depend on the build system path)

Link: https://github.com/openwrt/openwrt/pull/20389
Signed-off-by: Christian Marangi <[email protected]>