add_swiftcc.diff

diff --git a/Sources/CRuntime/include/CRuntime.h b/Sources/CRuntime/include/CRuntime.h
index 808d4c0..f4180d9 100644
--- a/Sources/CRuntime/include/CRuntime.h
+++ b/Sources/CRuntime/include/CRuntime.h
@@ -1,15 +1,16 @@
 #ifndef cruntime_h
 #define cruntime_h
 
+__attribute__((swiftcall))
 const void * _Nullable swift_getTypeByMangledNameInContext(
                         const char * _Nullable typeNameStart,
                         int typeNameLength,
                         const void * _Nullable context,
                         const void * _Nullable const * _Nullable genericArgs);
 
 const void * _Nullable swift_allocObject(
                     const void * _Nullable type,
                     int requiredSize,
                     int requiredAlignmentMask);
 
 #endif