[lmi] Copying compiler run-time files in the makefiles

[Vadim Zeitlin]

 Hello,

 I must be missing something here, but "make install" fails for me now,
when using LMI_TRIPLET=x86_64-w64-mingw32, with

0024:err:module:import_dll Library libgcc_s_seh-1.dll (which is needed by 
L"Z:\\opt\\lmi\\bin\\libxmlwrapp-6.dll") not found

and similar errors when trying to run product_files.exe

 Looking at the makefile, libgcc_s_seh-1.dll should have apparently been
copied to $(localbindir) when $(build_dir) was created. I am not sure I
understand why should build_dir depend on $(gpl_files) but, most of all,
this doesn't work for me because $(compiler_runtime_files) is empty in
GNUmakefile, as compiler_runtime_files is only set in compiler.make which
is included from workhorse.make, but not GNUmakefile itself.

 Again, I have a feeling that I'm misunderstanding something here because
this used to work and I don't see what could have changed this, but I just
don't see neither what could I be doing wrong.

 I can fix this locally, and even in the CI workflow, in a number of ways,
of course, but none of them seems right and I just don't understand how are
the current makefiles supposed to work, considering the above. Would you
have any idea about this, by chance?

 Thanks in advance,
VZ

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