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build: don't use tiered header checks.

This check is more reliable, and should be easier to deal with.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

--- a/configure.ac

+++ b/configure.ac

@@ -117,10 +117,11 @@

   dnl

   dnl Solaris: sys/scsi/scsi_types.h, sys/scsi/impl/uscsi.h

   dnl

-  AC_CHECK_HEADER(sys/scsi/scsi_types.h,[

-    AC_CHECK_HEADER(sys/scsi/impl/uscsi.h,[

-      AC_DEFINE(SOLARIS_USCSI, 1, Have userspace SCSI headers.)

-    ])

+  solaris_uscsi=yes

+  AC_CHECK_HEADERS([sys/scsi/scsi_types.h, sys/scsi/impl/uscsi.h], [],

+    [solaris_uscsi=no; break;])

+  AS_IF([test "$solaris_uscsi" = "yes"], [

+    AC_DEFINE(SOLARIS_USCSI, 1, Have userspace SCSI headers.)

   ])

   dnl

   dnl HP-UX: sys/scsi.h