More portability updates. Now compiles cleanly vs glibc, libc5, and uclibc

(except for mkfs_minix and fsck_minix -- and it doesn't yet link vs uclibc due
to missing stuff in the library).
 -Erik

sysklogd/syslogd.c

@@ -42,7 +42,7 @@
 #include <sys/param.h>
 #include <linux/unistd.h>
 
-#if __GNU_LIBRARY__ < 5
+#if ! defined __GLIBC__ && ! defined __UCLIBC__
 
 typedef unsigned int socklen_t;