Add MSYS2 based builder for libiconv #24
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This uses MSYS2 to run the autoconf based build chain of libiconv, but still uses MSVC tools and libraries for the actual compilation and linking.
This could be an option to resolve winlibs/libiconv#14. While there is no x86 builder yet, pdbs are missing, and the DLL doesn't conform to our naming standards, a PHP-8.4 build with the libiconv_a.lib from https://github.com/cmb69/winlib-builder/actions/runs/11577343626 worked flawlessly.
Of course, one might argue that all winlibs should only use "native" Windows tools for being built, I'd argue that we don't have sufficient capacities to really cater to that. For packages only offering autoconf based builds (like libiconv, gettext, etc.), we may be better off to actually use these, instead of trying to work around (and ignore possibly important updates).
PS: possibly useful: https://github.com/emilbayes/rename-dll