The save abstraction operation must use the basename without the extension for
the object name. This regression was introduced in rev. 752294af, the present
commit corrects this while still preventing string overflows.

NOTE: We've already done this for the mingw32 package in rev. 807068ce, which
was prompted by a recent upgrade of the dlfcn package in msys2 which no longer
ships that dll.

However, it seems that the new dlfcn package also breaks Gem. At present,
no-one knows what the actual issue with Gem is. But for the time being we have
to downgrade the mingw-w64-i686-dlfcn package from 1.2.0-2 to 1.2.0-1 (which
is known to work with Gem), until a future update of msys2 fixes the issue,
or we figure out a way to work around it in Gem.

Our inno Makefile assumed lua53, but lua54 is the version that msys2 has after
a recent update. So we now use a glob pattern in the Makefile to catch any
version of the lua dll that msys2 currently has.

This is needed to make builds on Arch work again.

Add a reminder to upgrade packages and add a line break to improve
readability (make a line code as code appearance).

Fix - Punctuations

See merge request jwilkes/purr-data!614

Not sure what this was used for. Could have been a remnant from ancient
Pd-extended builds where libdl was required to dynamically load at all,
but that's a shot in the dark.

Anyway, if we get reports in a future release of some external randomly
refusing to load under Windows, we may want to test whether this change
is the culprit.