Set user groups in exec_setup() if they were not already set by

policy_init_session().  Bug #749

src/sudo.h

@@ -129,6 +129,7 @@ struct user_details {
 #define CD_SUDOEDIT_COPY	0x08000
 #define CD_SUDOEDIT_FOLLOW	0x10000
 #define CD_SUDOEDIT_CHECKDIR	0x20000
+#define CD_SET_GROUPS		0x40000
 
 struct preserved_fd {
     TAILQ_ENTRY(preserved_fd) entries;