gnat-13.2.0-2 to bootstrap arm64

These binaries were built with gnat-macos-aarch64-13.2.1.tar.gz and ld-classic fix.

gnatprove-13.2.0-1

gnatprove-13.2.0-1

gprbuild-24.0.0-1

gprbuild-24.0.0-1

gnat-13.1.0-1: Merge pull request #1 from reznikmm/gnat-fsf-13

Aarch64 gnat 13.1.0-1 release

gnat-12.2.0-1

Aarch64 gnat 12.2.0-1 release

gprbuild-22.0.0-1

The targetset.xml files was patched with something like this:

   <targetset canonical="aarch64-linux">
     <target>aarch64-linux</target>
     <target>aarch64-linux-gnu</target>
+    <target>aarch64-unknown-linux-gnu</target>

gprbuild-21.0.0-2

The targetset.xml files was patched with something like this:

   <targetset canonical="aarch64-linux">
     <target>aarch64-linux</target>
     <target>aarch64-linux-gnu</target>
+    <target>aarch64-unknown-linux-gnu</target>

gnat-11.2.0-2

Build Linux tools on ubuntu-18.03 instead of latest