append build date at the end of help

BasiliskII/src/Unix/main_unix.cpp

@@ -410,6 +410,7 @@ static void usage(const char *prg_name)
 	);
 	LoadPrefs(NULL); // read the prefs file so PrefsPrintUsage() will print the correct default values
 	PrefsPrintUsage();
+	printf("\nBuild Date: %s\n", __DATE__);
 	exit(0);
 }
 

BasiliskII/src/Windows/main_windows.cpp

@@ -217,6 +217,7 @@ static void usage(const char *prg_name)
 	);
 	LoadPrefs(NULL); // read the prefs file so PrefsPrintUsage() will print the correct default values
 	PrefsPrintUsage();
+	printf("\nBuild Date: %s\n", __DATE__);
 	exit(0);
 }
 

SheepShaver/src/Unix/main_unix.cpp

@@ -375,6 +375,7 @@ static void usage(const char *prg_name)
 	printf("\nUnix options:\n");
 	printf("  --display STRING\n    X display to use\n");
 	PrefsPrintUsage();
+	printf("\nBuild Date: %s\n", __DATE__);
 	exit(0);
 }
 

SheepShaver/src/Windows/main_windows.cpp

@@ -158,6 +158,7 @@ static void usage(const char *prg_name)
 	printf("\nUnix options:\n");
 	printf("  --display STRING\n    X display to use\n");
 	PrefsPrintUsage();
+	printf("\nBuild Date: %s\n", __DATE__);
 	exit(0);
 }