Implement long-since-promised video functions defined in
<syslinux/video.h>.  Use these functions in initvesa.c instead of
open-coding the same functionality.

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

Impact: avoid code duplication

This will make code more generic, hdt will need it ;)

Actually provide real infrastructure for debug-to-serial.  Very
useful when debugging fullscreen applications, especially under an
emulator like Qemu.

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

Hook libansi.o into the lib/ build.

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>

Remove gzio.c, which is a zlib-specific stdio-like interface.  We
implement this in the actual filesystem layer, which is much cleaner.

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

Actually build the yuv420p converter again.

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

A lot of common resolutions, e.g. 800x600, include partial blocks at
the side of the image.  Implement that properly.

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

Add the unified dependency generation to com32/lib and com32/cmenu.

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

"make install" in the com32 directory currently installs the devel
environment, which should be build using the host toolchain... so make
it so.