Building GNAT on MUSL, now with partial and parallel build support

An update on the previous version.

The previous version needed git for getting the source of libelf-compat, this was ripped out1.
The previous version cleaned and reused the build directory for different stages, this was changed to use a separate build directory for each stage and no more cleanup. Last, the script now builds with parallel make options, further speeding up the build process2.

  1. A tarred version of libelf-compat does exist on the internets, however that version does not match the one in the git repository. []
  2. The problem with building in parallel seemed to be with some of the ada specific build rules. But changing those rules did nothing to fix the problem. In fact, the installation of a previous step had failed. Which was a direct result of using the environment variable MAKEFLAGS, this environment variable is used in the scripts but also read in the make program. So, make install was run with parallel jobs and promptly failed. The actions of one of the rules used a variable in a loop and that variable was changed by an action in another rule. The fix was 2-fold, use MAKEOPTS, change the install step to always use make -j1. []

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