The ChangeLog of all release gems was empty since we changed from mercurial to git.
On the other hand this file blocked simple "gem build pg.gemspec".
So let's remove the file.
With this patch rake-compiler executes not just "make" but also "make install" the same way as "gem install" does.
That way postgresql_lib_path.rb is copied into the lib folder as expected.
Version 1.0 switches to per-target docker images.
So there is a specific image for x64-mingw32 and one for x86-mingw32.
However our current logic mixes the build process of x86 and x64 behind several non-platform specific rake tasks.
This fails with rcd-1.0 since each image has only x64 OR x86 tools.
The solution in this commit is to separate each task by the platform value and to reference only the needed platform.
As an advantage we can now execute docker builds in parallel for x64 and x86 per multitask.
Since this conflicts with interactive password prompts, the gem signing key can be entered in advance.
rcd-1.0 does stripping of binaries per default, so our manual tasks are needless.
OpenSSL-1.1.1 doesn't build with latest rake-compiler-dock-0.7.2 which makes use of Ubuntu-16.04.
The temporary fix is to stick at version 0.7.1, which is based on ubuntu-18.04 and which has an newer mingw-w64 toolset.
Also add a patch to openssl for another bug in mingw-w64 regarding _onexit().
Lars Kanis