[PATCH V2 1/2] Define _POSIX_C_SOURCE if undefined

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config.c uses _POSIX_C_SOURCE which is defined in features.h when
glibc/uclibc is used, but isn't defined when musl is used.
So provide a reasonable default.

Signed-off-by: Khem Raj <raj.khem@xxxxxxxxx>
---
Changes since v1:
- Improve the commit meesage
- Divide into separate commit

 config.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/config.c b/config.c
index c58c8fe..b308b6c 100644
--- a/config.c
+++ b/config.c
@@ -63,6 +63,9 @@
  * but may not wrap over lines
  *
  */
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
+#endif
 
 #ifndef CONFFILE
 #define CONFFILE "/etc/mdadm.conf"
-- 
2.7.0

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