After https://github.com/termux/termux-packages/commit/e34ae5da030d,
llvm-config was created before termux_step_get_dependencies, meaning
that it gets overwritten if libllvm is installed.
Fix this by creating llvm-config in a new function
termux_step_override_config_scripts, that is run right after
termux_step_get_dependencies.
As replacement for TERMUX_PKG_QUICK_REBUILD. Running
./build-package.sh -c <package> starts a build for <package>, but does
not extract and patch the source from scratch. Instead it sets up the
build variables and starts from termux_step_make.
When working on a big package that can take hours to build it is
convenient to be able to build until there is an error, then apply
some new patch (manually) to the source, and then continue from where
the build failed.
Do not let privileged commands appear in build.sh. Any environment
configuration should be done by scripts like setup-ubuntu.sh. Execution
of arbitrary sudo commands could mess up host system, in case if not
building package in Docker container or VM.
termux-packages is not guaranteed to be always used as git repository.
Relying on git here may lead to issues.
P.S. Avoid unfinished work on master branch!
By moving the checks we can make the function more general, and
thereby re-use it for creating subpackages and potentially hostbuild
tools packages.
tests: building libandroid-support and build-essential.
Calls termux_git_clone_src if TERMUX_PKG_SRCURL ends with .git, and
termux_download_src_archive and termux_extract_src_archive otherwise.
termux_step_extract_package has been split up into the latter two
functions.
termux_step_post_extract_package has been renamed to
termux_step_post_get_source to reflect these changes.
