Patch from Firefox ESR 38 Void packaging.
--- mozilla/media/webrtc/signaling/src/sdp/sipcc/sdp_os_defs.h
+++ mozilla/media/webrtc/signaling/src/sdp/sipcc/sdp_os_defs.h
@@ -27,8 +27,5 @@
 typedef int16_t    int16;
 typedef unsigned short ushort;
 typedef unsigned long  ulong;
-#ifndef __GNUC_STDC_INLINE__
-#define inline
-#endif
 
 #endif /* _SDP_OS_DEFS_H_ */