maintainer-feedback requested: [Bug 268321] lang/mono: fix build with clang 15 (on i386)

Bugzilla Automation <bugzilla@FreeBSD.org> has asked freebsd-mono (Nobody)
<mono@FreeBSD.org> for maintainer-feedback:
Bug 268321: lang/mono: fix build with clang 15 (on i386)
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268321



--- Description ---
During an exp-run for llvm 15 (see bug 265425), it turned out that lang/mono
failed to build with clang 15, on i386:

  mini-runtime.c:806:24: error: incompatible pointer to integer conversion
assigning to 'guint32' (aka 'unsigned int') from 'MonoLMF *' (aka 'struct
MonoLMF *') [-Wint-conversion]
	  ext->lmf.previous_lmf = *lmf_addr;
				^ ~~~~~~~~~
  mini-runtime.c:808:24: error: incompatible pointer to integer conversion
assigning to 'guint32' (aka 'unsigned int') from 'gpointer' (aka 'void *')
[-Wint-conversion]
	  ext->lmf.previous_lmf = (gpointer)(((gssize)ext->lmf.previous_lmf) |
2);
				^
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

As noted, this is because on i386 the previous_lmf field is declared as
guint32, while other architectures use gpointer.

Upstream changed the field to gpointer in
<https://github.com/mono/mono/pull/8308/commits/1c43a8476b5>, which got merged
into main in <https://github.com/mono/mono/commit/384c4a4e2ea>.