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Use scons target and dependency system instead of ad-hoc options.

Now is simply a matter of naming what to build. For example:

  scons libgl-xlib

  scons libgl-gdi

  scons graw-progs

  scons llvmpipe

and so on. And there is also the possibility of scepcified subdirs, e.g.

  scons src/gallium/drivers

If nothing is specified then everything will be build.

There might be some rough corners over the next days. Please bare with me.

Fixes some VTX protection errors introduced by e89af209.

[olv: formatted for 80-column wrapping]

API_DEFINES is the defines for libmesagallium.a.  Append it to
egl_CPPFLAGS only when st_GL.so, which uses libmesagallium.a, is built.

Prefix EGL driver names by "egl_".  Make it clear that EGL_CLIENT_APIS
is only used by egl_gallium.

https://bugs.freedesktop.org/show_bug.cgi?id=28294

Previously nouveau_state_emit() was being called directly, sometimes
that doesn't work because it doesn't update the derived GL context.

Without this, update_textures may not pick up the new pipe_resource.

It is actually update_textures that should check
stObj->sampler_view->texture != stObj->pt, but let's follow st_TexImage
and others for now.

Fixes fd.o bug 31128.

Make it a warning for now to smooth the transition.

It's also equivalent to Elements(...) which is already used elsewhere.

Fixes failure on restoring state when the program was active but
deleted, and the name no longer exists.

Bug #31194

Fix

  $ make CC="ccache gcc"

Conflicts:
	src/mapi/glapi/glapi_sparc.S
	src/mapi/glapi/glapi_x86.S
	src/mapi/glapi/glapidispatch.h
	src/mapi/glapi/glapioffsets.h
	src/mapi/glapi/glprocs.h

Output API info first.  Move GLU/GLw/GLUT and EGL near driver info.

Make autoconf decide the client APIs enabled first.  Then when OpenGL
and OpenGL ES are disabled, there is no need to build src/mesa/;  when
OpenGL is disabled, no $mesa_driver should be built.  Finally, add
--enable-openvg to enable OpenVG.

With these changes, an OpenVG only build can be configured with

  $ ./configure --disable-opengl --enable-openvg

src/mesa, src/glsl, and src/glx will be skipped, which saves a great
deal of compilation time.

And an OpenGL ES only build can be configured with

  $ ./configure --disable-opengl --enable-gles-overlay

Some integer formats work with some packed datatypes.