Remove remaining libc5 support code

libbb/syscalls.c

@@ -27,10 +27,6 @@
    _syscall* defined.  */
 #define __LIBRARY__
 #include <sys/syscall.h>
-#if __GNU_LIBRARY__ < 5
-/* This is needed for libc5 */
-#include <asm/unistd.h>
-#endif
 #include "libbb.h"
 
 int sysfs( int option, unsigned int fs_index, char * buf)
@@ -59,9 +55,9 @@ int pivot_root(const char * new_root,const char * put_old)
 
 
 
-#if __GNU_LIBRARY__ < 5 || ((__GLIBC__ <= 2) && (__GLIBC_MINOR__ < 1))
+/* These syscalls are not included in ancient glibc versions */
+#if ((__GLIBC__ <= 2) && (__GLIBC_MINOR__ < 1))
 
-/* These syscalls are not included as part of libc5 */
 int bdflush(int func, int data)
 {
     return(syscall(__NR_bdflush, func, data));
@@ -96,7 +92,7 @@ int umount2(const char * special_file, int flags)
 }
 
 
-#endif /* __GNU_LIBRARY__ < 5 */
+#endif
 
 
 /* END CODE */