[patch] Client-only installation on Windows

Hello,

According to this page,

http://www.postgresql.org/docs/current/static/install-procedure.html

client-only installation is possible on UNIX/Linux like this:

gmake -C src/bin install
gmake -C src/include install
gmake -C src/interfaces install
gmake -C doc install

With the attached patch, you can do client-only installation on Windows like
this:

install.bat <install_dir> client

This installs:

* client applications (both core and contrib)
* DLLs for libpq and ECPG
* header files
* import libraries
* pg_service.conf.sample and psqlrc.sample
* symbol files (*.pdb) for the above modules

If the second argument is given as "client" or omitted, all files are
installed. With 9.4, the whole installation takes up about 80 MB, and the
client-only installation takes up only 24 MB.

Any comments would be appreciated.

Regards
MauMau