Prepare for a cleaner docker build.
* configure.ac (DOCKERBUILD): New am_conditional (TOPSRCDIR,PLAYGROUND): New ac_subst. * m4/gpg4win.m4 (GPG4WIN_PACKAGES): Auto-detect the packages directory. (GPG4WIN_BUILD_RELEASE): New. Moved from acinclude.m4. * acinclude.m4: Remove. * src/Makefile.am (tsdir): Set tsdir and root using another approach. (show-directory-info): New. * src/gpg4win.mk.in: Remove the chmod thingies by a direct invocation via /bin/sh. (-DCMAKE_TOOLCHAIN_FILE): Set the value to the build directory. (-DCMAKE_PREFIX_PATH): Set to the generic install directory. (installer): Move them to the build directory.
This is a first step, some other things need to be done as well.