constructormagic.h macros are duplicated in several repositories. undef them in webrtc to prevent conflict for some build configurations.
constructormagic.h macros are duplicated in several repositories. undef them in webrtc to prevent conflict for some build configurations.

BUG=N/A
R=minyue@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/18619004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@6554 4adac7df-926f-26a2-2b94-8c16560cd09d

mwgoldsmith/ilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,mwgoldsmith/ilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,mwgoldsmith/libilbc,mwgoldsmith/ilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,mwgoldsmith/libilbc,mwgoldsmith/libilbc,mwgoldsmith/libilbc,ShiftMediaProject/libilbc,mwgoldsmith/ilbc