More flexibility in the options with this script.

[SuperGNUS]

This adds much more flexibility to the script to not download the Boost Library or clear it out except when you add --clean for it.

Also added some more options to where to build the library and where to source it from.

[SuperGNUS]

This finally fixes the Linux building of Android, at least on Ubuntu 2.7.6, because patch ver 2.7.6 doesn't patch symlinks, you need to patch the original file. it took a long time to figure this out!

[pelya]

You have missed some variable, because CI script downloads 1.80.0 but tries to build 1.78.0

Building boost version: 1.80.0 Detected Android NDK version 25.1 Building with TOOLSET=clang CONFIG_VARIANT=ndk23 CXXPATH=/usr/local/lib/android/sdk/ndk/25.1.8937393/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ CFLAGS= CXXFLAGS=-std=c++14 ./build-android.sh: 491: cd: can't cd to boost_1_78_0 Performing boost bootstrap ERROR: Could not perform boostrap! See /home/runner/work/Boost-for-Android/Boost-

[pelya]

Still the same problem with CI, the script uses incorrect Boost version

Building boost version: 1.79.0 Detected Android NDK version 25.0 Building with TOOLSET=clang CONFIG_VARIANT=ndk23 CXXPATH=/usr/local/lib/android/sdk/ndk/25.0.8775105/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ CFLAGS= CXXFLAGS=-std=c++14 ./build-android.sh: 492: cd: can't cd to boost_1_78_0

[pelya]

CI still fails, I cannot merge this

[pelya]

Github actions are broken from the server side. 'Waiting for a runner' but no runner is available, previously rhe same CI script was working fine.