[S] Change in coreboot[master]: doc/Makefile: Fix build dir setting

[Felix Singer (Code Review)]

Attention is currently required from: Elyes Haouas, Felix Held, Jan Samek, Martin L Roth, Nico Huber.

Hello Elyes Haouas, Felix Held, Jan Samek, Martin L Roth, Nicholas Chin, Nico Huber, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/75893?usp=email

to look at the new patch set (#4).

Change subject: doc/Makefile: Fix build dir setting
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doc/Makefile: Fix build dir setting

The commit 4d8da8ed ("Docs: Update sphinx targets with the build directory")
introduces an additional variable intending to allow an user to specify
a different build directory. Since the variable is not writable from the
outside and also the Docker container used to build doc.coreboot.org
calls the Makefile with `BUILDDIR` instead of `SPHINXDIR`, building the
documentation within the container doesn't work anymore.

Thus, change the variable name to `BUILDDIR` and make it writable.

Steps to reproduce:

cd util/docker
  make doc.coreboot.org
  make docker-build-docs

Change-Id: Ibc44134cf1996592597252aeb9dcf7ffb3378ee3
Signed-off-by: Felix Singer 
---
M Documentation/Makefile
1 file changed, 8 insertions(+), 8 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/93/75893/4