Fix build issue with newer Wayland headers
Newer wayland-util.h headers make use of the STDC_VERSION macro which is not defined in C++ compilers. This causes a compiler error. This is fixed by defining the macro to 0 (if not already defined) before we include wayland-client.h
Signed-off-by: Dennis Tsiang dennis.tsiang@arm.com Change-Id: I08667ab78042257db3dba34f554036cf77aa10ee