Fix crash when there's a \' in the arguments.

	Fixes crash when calling Process.Start on a file with a ' in the path
	when UseShellExecute is set to false.

	Patch by Tom Philpot.

eglib/src/gshell.c

@@ -225,7 +225,7 @@ g_shell_unquote (const gchar *quoted_string, GError **error)
 			}
 		} else if (*p == '\\'){
 			char c = *(++p);
-			if (!(c == '$' || c == '"' || c == '\\' || c == '`' || c == 0))
+			if (!(c == '$' || c == '"' || c == '\\' || c == '`' || c == '\'' || c == 0 ))
 				g_string_append_c (result, '\\');
 			if (c == 0)
 				break;