tgt: include <sys/reg.h> only for musl

srcpkgs/tgt/patches/musl-__wordsize.patch

@@ -2,31 +2,37 @@ The definition of __WORDSIZE is found in <sys/reg.h>
 
 --- usr/iscsi/iscsid.h	2015-11-03 04:58:36.000000000 +0100
 +++ usr/iscsi/iscsid.h	2015-11-04 16:23:25.029877334 +0100
-@@ -22,6 +22,7 @@
+@@ -22,6 +22,9 @@
  #include <stdint.h>
  #include <inttypes.h>
  #include <netdb.h>
++#if !defined(__GLIBC__)
 +#include <sys/reg.h>
++#endif
  
  #include "transport.h"
  #include "list.h"
 --- usr/tgtd.h	2015-11-04 16:25:05.435884573 +0100
 +++ usr/tgtd.h	2015-11-04 16:25:52.415887960 +0100
-@@ -2,6 +2,7 @@
+@@ -2,6 +2,9 @@
  #ifndef __TARGET_DAEMON_H
  #define __TARGET_DAEMON_H
  
++#if !defined(__GLIBC__)
 +#include <sys/reg.h>
++#endif
  #include "log.h"
  #include "scsi_cmnd.h"
  #include "tgtadm_error.h"
 --- usr/util.h	2015-11-04 16:26:22.262890112 +0100
 +++ usr/util.h	2015-11-04 16:27:01.364892931 +0100
-@@ -16,6 +16,7 @@
+@@ -16,6 +16,9 @@
  #include <string.h>
  #include <limits.h>
  #include <linux/types.h>
++#if !defined(__GLIBC__)
 +#include <sys/reg.h>
++#endif
  
  #include "be_byteshift.h"