Add the possibility to change the make directroy
This adds gpg4win_pkg_<name>_make_dir to change the directory in which make is called. This path is relative to the packages source directory. Used for gettext to build only gettext-runtime * src/Makefile.am: Set make directories for gettext to build only runtime. * src/gpg4win.mk.in: Add gpg4win_pkg_<name>_make_dir and handle it.
- Gettext-tools are uneccessary for us and don't compile with mingw-w64 withot patches. And while this adds an additional config macro it gives us more flexibility in the build process to handle such things.