[moz] Disable warnings in the build.

Building DXC generates more than 1GB of warnings in the log making the log unusable and any interesting warning would get lost in the mass. For taskcluster builds it's better to simply remove all of them.

Author: nical

CMakeLists.txt

@@ -26,6 +26,8 @@ if (POLICY CMP0051)
   cmake_policy(SET CMP0051 OLD)
 endif()
 
+add_compile_options(-w)
+
 if(CMAKE_VERSION VERSION_LESS 3.1.20141117)
   set(cmake_3_2_USES_TERMINAL)
 else()