set type 'settings' to 'none' in gyp file in case using the system lib

Contributed by robert.nagy@gmail.com

BUG=None
TEST=None
Review URL: http://codereview.chromium.org/8692003

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/speex@111570 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
diff --git a/speex.gyp b/speex.gyp
index b98c56b..ea5e0ef 100644
--- a/speex.gyp
+++ b/speex.gyp
@@ -94,7 +94,7 @@
       'targets': [
         {
           'target_name': 'libspeex',
-          'type': 'settings',
+          'type': 'none',
           'direct_dependent_settings': {
             'cflags': [
               '<!@(pkg-config --cflags speex)',