Bug fix release with various build/CI improvements and minor
fixes since 6.0.2.
LTO triggers internal compiler errors when building libassimp
against gcc-14 (with the OpenWrt fortify headers in the LTO
unit). Switch PKG_BUILD_FLAGS to 'gc-sections no-lto' to
unblock the build.
Link: https://github.com/assimp/assimp/releases/tag/v6.0.5
Signed-off-by: Daniel Golle <daniel@makrotopia.org>