suppress compiler errors about noexcept name mangling changes

Summary:
Stop gcc 7+ from complaining about the fact that function name mangling of
noexcept functions changes between the C++14 and C++17 dialect options.

Note that there are still a number of other compiler warnings emitted about
signed/unsigned comparison mismatches and unused function parameters.
However those are treated simply as warnings rather than errors and do not
cause the build to fail.

Reviewed By: phoad

Differential Revision: D10380761

fbshipit-source-id: eb2c2da2b12e284ec81256f08959826862ac6c50

Author: simpkins

CMakeLists.txt

@@ -157,6 +157,7 @@ set(CMAKE_CXX_STANDARD 14)
 
 # Common configuration for all build modes.
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-noexcept-type")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Woverloaded-virtual")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g")