Add explicit modulemap path to take priority over modulemap from SDK (#36) (#38)

Author: jmschonfeld

icuSources/CMakeLists.txt

@@ -18,6 +18,9 @@ target_include_directories(_FoundationICU
     PUBLIC
         include/)
 
+target_compile_options(_FoundationICU INTERFACE
+  "$<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xcc -fmodule-map-file=${CMAKE_CURRENT_SOURCE_DIR}/include/_foundation_unicode/module.modulemap>")
+
 add_subdirectory(common)
 add_subdirectory(i18n)
 add_subdirectory(io)