Add patch to set -fcoroutines flag

ports/concurrencpp/enable-coroutines-flag.patch

@@ -0,0 +1,13 @@
+diff --git a/cmake/coroutineOptions.cmake b/cmake/coroutineOptions.cmake
+index 14a60c3..c13f3b3 100644
+--- a/cmake/coroutineOptions.cmake
++++ b/cmake/coroutineOptions.cmake
+@@ -14,6 +14,8 @@ function(target_coroutine_options TARGET)
+     target_compile_options(${TARGET} PUBLIC -stdlib=libc++ -fcoroutines-ts)
+     target_link_options(${TARGET} PUBLIC -stdlib=libc++)
+     set_target_properties(${TARGET} PROPERTIES CXX_EXTENSIONS NO)
++  elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
++    target_compile_options(${TARGET} PUBLIC -fcoroutines)
+   else()
+     message(FATAL_ERROR "Compiler not supported: ${CMAKE_CXX_COMPILER_ID}")
+   endif()

ports/concurrencpp/portfile.cmake

@@ -5,6 +5,7 @@ vcpkg_from_github(
   SHA512 48e3acca73c7b06940d41e84334cec56e7657c45f862d53e8e4ca1fb76b792c5b136ce4eeaf8afb8db95e746442fb45031c2c695ce60fcbe92ce91e5e1e80b25
   HEAD_REF master
   PATCHES
+    enable-coroutines-flag.patch
     make-linkage-configurable.patch
     fix-include-path.patch
 )