One more attempt at getting semi-sanity to "make install".
Realistically, the install/netinstall/install-all/... needs to be
pushed into the com32 Makefiles, but this is at least a quick hack.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

"make clean" must NOT remove stuff that "make installer" should not
rebuild.  This is a somewhat unfortunate choice of naming, but that's
the way it is.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Add the pxechain module from Jeffery Hutzelman at CMU.
Create new modules directory for non-com32 modules.
Centralize installation, since we have three types of install, and
only one of them was distributed.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Avoid leaving obvious password turds in memory.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Unify common pieces to "embedded" targets (those that produce code
that runs neither in the host nor in a com32 environment); this fixes
the broken sample/ directory Makefile.

Cleanup and centralize the Makefile system even more.
Fix a gcc 4.3 incompatibility in memdisk (definition of strlen).

Compile with -std=gnu99, this allows us to define initializers inside
for() loops, which makes certain kinds of ugly macros easier to write.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Begin the process of centralizing configurables.

Improve "make install" and "make netinstall"; add "make
extbootinstall".

Move source files out of the root directory; the root is a mess and
has become virtually unmaintainable.  The Syslinux core now lives in
core/; the Linux and generic utilities has moved into utils/, and
copybs.com has moved into dos/; it had to go somewhere, and it seemed
as good a place as any.