Change in flashrom[1.0.x]: spi: Define _XOPEN_SOURCE to get ffs() from strings.h

[Nico Huber (Code Review)]

Nico Huber has submitted this change and it was merged. ( https://review.coreboot.org/22951 )

Change subject: spi: Define _XOPEN_SOURCE to get ffs() from strings.h
......................................................................

spi: Define _XOPEN_SOURCE to get ffs() from strings.h

Fixes build with Musl libc.

Change-Id: I92b69300a302c4491e234666ac371027571801c9
Signed-off-by: Nico Huber 
Reviewed-on: https://review.coreboot.org/22951
Tested-by: build bot (Jenkins) 
Reviewed-by: Paul Menzel 
Reviewed-by: David Hendricks 
---
M spi.c
1 file changed, 2 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Paul Menzel: Looks good to me, but someone else must approve
  David Hendricks: Looks good to me, approved

diff --git a/spi.c b/spi.c
index 894f73f..c306ac3 100644
--- a/spi.c
+++ b/spi.c
@@ -22,6 +22,8 @@
  * Contains the generic SPI framework
  */

+#define _XOPEN_SOURCE 700	/* for ffs() */
+
 #include <strings.h>
 #include <string.h>
 #include "flash.h"