appimage: Reorder Makefile variable setting and change some names
* src/gpg4win.mk.in: Move setting and creation of bdir, idir, etc. to... * src/Makefile.am: here, where we already set the root dir var. Print some of the directories. (tsdir, root): Set tsdir and root using another approach. (pdir): Rename to patdir. Change all users. * src/gpg4win.mk.in (pkgpbdir): Rename to pkgpatbdir. (pkgpdir): Rename to pkgpatdir.
This should make things easier to understand. Also documented the
directory names.
Based on similar changes for the Gpg4win build made with e9d7b878 ff.
- GnuPG-bug-id: T7509