mdadm.h: fix ugly glibc specific ifdeffery

the code that was exposed on anything else than dietlibc and klibc
is entirely glibc specific and broke the build on musl libc.

Signed-off-by: John Spencer <maillist-mdadm@barfooze.de>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/mdadm.h b/mdadm.h
index a761f298..7ffac8f9 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -25,9 +25,9 @@
 #define	_GNU_SOURCE
 #define _FILE_OFFSET_BITS 64
 #include	<unistd.h>
-#if !defined(__dietlibc__) && !defined(__KLIBC__)
+#ifdef __GLIBC__
 extern __off64_t lseek64 __P ((int __fd, __off64_t __offset, int __whence));
-#else
+#elif !defined(lseek64)
 # if defined(__NO_STAT64) || __WORDSIZE != 32
 # define lseek64 lseek
 # endif