Looking to deprecate GRC_PREFS_PATH use in mingw64

Hello All,

I'm trying to get a build of gnuradio running under mingw64. It is
installed and works mostly. I've patched it with Ryan Volz's patch
for removing the global_blocks_path in favour of using prefix to set
the blocks path. This works and I no longer need to set the
environment variable GRC_BLOCKS_PATH in my .bashrc to launch
gnuradio-companion.py.

I'm wondering if there is an analogous solution to the use of
GRC_PREFS_PATH? I currently have to set GRC_PREFS_PATH to the
grc.conf file in my .bashrc to have gnuradio-companion.py to save the
file on exit. I don't have a problem with this, but it would be nice
to have it save the prefs path to a place in my home directory when it
exits without the use of the environment variable.

I also noticed in my travels that the .config/gnuradio/grc.conf has
become a directory, I assume to facilitate the progression to using
the qt-gui. Is the correct location for the grc.conf file
.config/gnuradio/grc.conf/grc.conf?

I'm currently running main's 5c1edfe06 git hash as qwt-qt5 is at 6.3.0
under mingw64 and the 3.10.10.0 release requires that qwt-qt5 be less
than 6.3.0. Perhaps I should be using a different branch?

Thanks for your time.

Chris