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Support older hosts with latest util-linux-native

mkostemp is not defined on older machines.  So we detect this and
provide a define that uses mkstemp instead.

O_CLOEXEC is not defined on older machines.  It is however defined
in the 'c.h' header.  Fix up the users to include 'c.h'.

fdisks/fdisksunlabel.c was modified to use qsort_r, however
this is not defined on older hosts.  Revert:
  commit c69bbca9c1f6645097bd20fe3a21f5a99a2a0698
  fdisk: (sun): use ask API, remove global variable

Upstream-Status: Inappropriate [other]
Patches revert upstream changes in order to support older
machines.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>

--- a/configure.ac
+++ b/configure.ac
@@ -299,6 +299,7 @@ AC_CHECK_FUNCS([ \
 	llseek \
 	lseek64 \
 	mempcpy \
+	mkostemp \
 	nanosleep \
 	personality \
 	posix_fadvise \
--- a/include/c.h
+++ b/include/c.h
@@ -236,6 +236,13 @@ static inline int dirfd(DIR *d)
 #endif
 
 /*
+ * mkostemp replacement
+ */
+#ifndef HAVE_MKOSTEMP
+#define mkostemp(template, flags) mkstemp(template)
+#endif
+
+/*
  * MAXHOSTNAMELEN replacement
  */
 static inline size_t get_hostname_max(void)
--- a/lib/randutils.c
+++ b/lib/randutils.c
@@ -16,6 +16,7 @@
 #include <sys/syscall.h>
 
 #include "randutils.h"
+#include "c.h"
 
 #ifdef HAVE_TLS
 #define THREAD_LOCAL static __thread
--- a/lib/wholedisk.c
+++ b/lib/wholedisk.c
@@ -10,6 +10,7 @@
 
 #include "blkdev.h"
 #include "wholedisk.h"
+#include "c.h"
 
 int is_whole_disk_fd(int fd, const char *name)
 {