All flags which are used now for building Win32 version of LMMS are now
defined in the top level build_mingw32 script instead of the
Win32Toolchain cmake files.
Cross compile support for Win32 and Win64 has been unified,
simplified and adapted to the new MinGW64-based build environment.
This finally allows to produce working Win64 binaries.
(cherry picked from commit 51103bb674)
Fixed invocation of cmake in the MinGW cross compiling script so it
works properly when doing an out-of-tree build (which should be the
default way of building LMMS).
Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>
(cherry picked from commit 8c50e0ef9a)
