Linux: fix build with system speex (1/2)

BUG=145507
TEST=none
Review URL: https://chromiumcodereview.appspot.com/11044009

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/speex@160092 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed