In generalize case, optimization options should be passed to all stages of
the build process.

Expected to be set on command line, with the idea being that for different
targets, there're different smartass ABIs which strive to put unneeded
sections into executables, etc., so let people have flexible way to
strip that.

The option name is similar to previously introduced CLFAGS_EXTRA &
LDFLAGS_EXTRA.

Refactored some stmhal files which are shared with teensy.

Any generated headers go in $(BUILD)/genhdr/, and are #included as
'genhdr/xxx.h'.

The autogenerated header files have been moved about, and an extra
include dir has been added, which means you can give a custom
BUILD=newbuilddir option to make, and everything "just works"

Also tidied up the way the different Makefiles build their include-
directory flags

make 'make clean' cleaner  ;-)

The problem manifests itself in make 4.0

I also fixed the LINK message when linking the final executable for unix and unix-cpy.