Simplify further

Use Makefile fragment on Windows

A few minor fixes and nits

Fix header installs

Fix 32-bit Windows

Fix Windows build

This is a super hacky solution, but should work for any shared builds.
First we need to fix the obj filenames, since these are expected in the
src/ subfolder. To t

Fix Windows build

This is a super hacky solution, but should work for any shared builds.
First we need to fix the obj filenames, since these are expected in the
src/ subfolder. To trigger their compilation, we write the required
dependency rules manually to the Makefile. Finally we add the assembler
obj files as LD_FLAGS.

A clean solution would be to support asm files as source files in the
Windows build chain. If that does not happen, at least we should use
a Makefile.fragment, to avoid the dependency on `MFO`. We also should
strive to minimize the use of global variables in config.w32.

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Try ASM on Windows

Fix windows compilation

Fix Windows build

Rename to ext-fiber

Renamed Fiber::yield() to Fiber::suspend()

Imported native fibers into new task extension.