Revert homogenize msvs and ninja library_dir and libraries settings for

Review URL: https://codereview.chromium.org/25594002

git-svn-id: http://gyp.googlecode.com/svn/trunk@1744 78cadc50-ecff-11dd-a971-7dbc132099af
Add an option to prune targets

Normally, when a target in file1.gyp depends on a target in file2.gyp,
gyp will generate projects for all targets in file2.gyp, even if the
target in file1.gyp does not depend on all of them.

This patch adds a '--root-target' command-line option, which allows users
to specify a list of "root" targets in the dependency tree.  When this
list is provided, gyp will only generate projects for targets that
are deep dependencies of these root targets.

As an example, when used in the chromium repository, running 'gyp_chromium'
with 'content.gyp' generates 397 subninja files.  With '--root-target=content'
specified, this is reduced to just 260 subninja files.

BUG=
R=mark@chromium.org

Review URL: https://codereview.chromium.org/24803004

git-svn-id: http://gyp.googlecode.com/svn/trunk@1745 78cadc50-ecff-11dd-a971-7dbc132099af
Revert r1745: "Add an option to prune targets"

The test does not work on xcode.

BUG=
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/25398003

git-svn-id: http://gyp.googlecode.com/svn/trunk@1746 78cadc50-ecff-11dd-a971-7dbc132099af