Display the help text of -fwinmain on both Win32 and Cygwin

Author: ddeclerck

cobc/ChangeLog

@@ -152,7 +152,7 @@
 	  internally disabling it for generation of libraries/executable after
 	  first program as we only need that code once, fixing Win32 build errors
 	  and duplication warnings in other environments
-	* flag.def: don't suppress the help of -fwinmain under Win32
+	* flag.def: don't suppress the help of -fwinmain under Win32 and Cygwin
 	* typeck.c (build_expr_finish): use fallback error position token, fixing
 	  compiler aborts on broken expressions, bugs #933, #938 and #966
 	* typeck.c: minor refactoring within functions

cobc/flag.def

@@ -109,7 +109,7 @@ CB_FLAG_NQ (1, "default-file-colseq", CB_FLAG_GETOPT_DEFAULT_FILE_COLSEQ,
 	  "                        * default: NATIVE"))
 
 /* Binary flags, partially with suppressed help */
-#ifdef _WIN32
+#if defined (_WIN32) || defined (__CYGWIN__)
 #define COB_SHOW 1
 #else
 #define COB_SHOW 0