getdeps: enable -fcoroutines for GCC in edencommon and watchman

Summary:
Enable -fcoroutines on GCC for edencommon and watchman OSS cmake builds to match folly and [fbthrift](https://github.com/facebook/fbthrift/blob/197890bbedd4942809b91139f9a2890c8f167045/CMakeLists.txt#L64-L75).  This is similar to changes made in D64911998

Also regenerated edencommon github CI, it was outdated and [broken](https://github.com/facebookexperimental/edencommon/actions/runs/11822790846/job/32940614642)

Reviewed By: xavierd

Differential Revision: D65944686

fbshipit-source-id: 23c323b484638934d107af6c3487528945c45b06

CMakeLists.txt

@@ -12,7 +12,17 @@ set(CMAKE_MODULE_PATH
   "${CMAKE_CURRENT_SOURCE_DIR}/build/fbcode_builder/CMake"
   ${CMAKE_MODULE_PATH})
 
-set(CMAKE_CXX_STANDARD 17)
+if(NOT CMAKE_CXX_STANDARD)
+  set(CMAKE_CXX_STANDARD 17)
+  set(CMAKE_CXX_STANDARD_REQUIRED ON)
+  message(STATUS "setting C++ standard to C++${CMAKE_CXX_STANDARD}")
+endif()
+
+# Explicitly enable coroutine support, since GCC does not enable it
+# by default when targeting C++17.
+if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+  add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fcoroutines>)
+endif()
 
 if (WIN32)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DWIN32_LEAN_AND_MEAN -DNOMINMAX -DSTRICT")