Fix 'replacement operator delete cannot be inline' GCC warning (Cygwin)

(fix commits 83e0a2c, 3379238)

This commit also eliminates
"operator delete is missing exception specification throw()" compiler
warning.

* gc_cpp.cc (operator delete): Define unconditionally (i.e. for Cygwin
too).
* include/gc_cpp.h [__CYGWIN__]: Do not include "new" header.
* include/gc_cpp.h [__CYGWIN__] (operator delete): Remove (as
replacement function 'operator delete' cannot be declared 'inline').

1 files changed, 3 insertions, 5 deletions

diff --git a/gc_cpp.cc b/gc_cpp.cc
index 8718f5a1..6f25e336 100644
--- a/gc_cpp.cc
+++ b/gc_cpp.cc
@@ -49,11 +49,9 @@ built-in "new" and "delete".
     return GC_MALLOC_UNCOLLECTABLE(size);
   }
 
-# if !defined(__CYGWIN__)
-    void operator delete(void* obj) GC_DECL_DELETE_THROW {
-      GC_FREE(obj);
-    }
-# endif // !__CYGWIN__
+  void operator delete(void* obj) GC_DECL_DELETE_THROW {
+    GC_FREE(obj);
+  }
 
 # ifdef GC_OPERATOR_NEW_ARRAY
     void* operator new[](size_t size) GC_DECL_NEW_THROW {