emulators/wine: support graphics/mesa-devel for WoW64

WoW64 currently uses i386 packages on amd64 under special PREFIX, so

• Include mesa-devel paths to LIBGL_DRIVERS_PATH override
• Respect libmap.conf(5) in 32-bit packages

To use simply install mesa-devel as regular and WoW64 package e.g.,
$ pkg install mesa-devel
$ /usr/local/share/wine/pkg32.sh install mesa-devel

In case of issues simply remove mesa-devel e.g.,
$ pkg delete mesa-devel
$ /usr/local/share/wine/pkg32.sh delete mesa-devel

PR: 271140
Reviewed by: Alex S
Approved by: maintainer timeout (2 months)