MSYS2 and libfdt

[Thomas Huth]

 Hi all,

in some spare minutes, I started playing with a patch to try to remove the 
dtc submodule from the QEMU git repository - according to 
https://repology.org/project/dtc/versions our supported build platforms 
should now all provide the minimum required version.

However, I'm hitting a problem with Windows / MSYS2 in the CI jobs: The 
libfdt is packaged as part of the dtc package there:

 https://packages.msys2.org/package/dtc

... meaning that it is added with a usr/include and usr/lib path prefix 
instead of mingw64/include and mingw64/lib like other packages are using 
(see e.g. 
https://packages.msys2.org/package/mingw-w64-x86_64-zlib?repo=mingw64). Thus 
the compiler does not find the library there. Also there does not seem to be 
a difference between a i686 (32-bit) and x86_64 (64-bit) variant available 
here? Does anybody know how libfdt is supposed to be used with MSYS2 ?

 Thomas