Support to build nginx from an out-of-tree directory

[Emmanuel Deloget]

Hello list,

Attached you'll find a small patch that allow someone to build nginx from a
random directory. Its goal is to support the persons who want to test multiple
build of nginx, or people who do not want to pollute the nginx source tree
with files and directories that do not belong here.

Here is a sample use:

~$ tar zxvf nginx-1.0.9.tar.gz
~$ mkdir nginx-build && cd nginx-build
~$ ../nginx-1.0.9/configure --prefix=/home/me/nginx --user=me --group=me
~$ make && make install

The role of the patch is to find where the nginx source are located (thankfully,
this path is also the path were the configure script is stored) and to setup the
build directory in order to allow successfull compilation and installation of
nginx.

It successfully isolate the build directory from the source directory, unlike
the --builddir option (which still add some files in the source directory).

Signed-Off-By: Emmanuel Deloget <logout at free.fr>

Best regards,

-- Emmanuel Deloget
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