Minor fixes to avoid compiling error on FreeBSD following Linux fixes.

doas.c

@@ -510,17 +510,17 @@ main(int argc, char **argv)
 		}
 		pam_end(pamh, pam_err);
 
-/* #ifndef linux */
+#ifndef linux
 		/* Re-establish stdin */
 		if (dup2(temp_stdin, STDIN_FILENO) == -1)
 			err(1, "dup2");
 		close(temp_stdin);
-/* #else */
+#else 
 		/* Re-establish stdout */
 		close(1);
 		if (dup2(temp_stdout, 1) == -1)
 			err(1, "dup2");
-/* #endif */
+#endif 
 #else
 #error	No auth module!
 #endif

env.c

@@ -90,7 +90,9 @@ createenv(struct rule *rule)
 	env->count = 0;
 
 	if (rule->options & KEEPENV) {
-		/* extern const char **environ; */
+                #ifndef linux
+		extern const char **environ;
+                #endif
 
 		for (i = 0; environ[i] != NULL; i++) {
 			struct envnode *node;