Building OpenJDK9 on MSYS2

[Andrew Sun]

I tried Peter Budai's patches from mingw-w64-openjdk branch, but it failed
due to using dlfcn.h instead of windows.h in
jdk9-jdk-9+181/hotspot/src/share/vm/utilities/globalDefinitions_gcc.hpp.

After guarding dlfcn.h with #ifdef linux #endif and adding the windows.h
include, it compiled fine until a symlink error, "File name too long",
failing the ZipSource.gmk and the entire build.

Andrew Sun



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