build-sys: Look for both linux/mount.h and sys/mount.h

Since that's what composefs uses.

diff --git a/configure.ac b/configure.ac
index c1c8ae78b07085968541ec3841c06d2a8eb00b92..20f9e4ed3a30fc900f1636f36afa11c4e8d4678b 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -278,6 +278,7 @@ dnl composefs won't work at all without this
 AC_MSG_CHECKING([for MOUNT_ATTR_IDMAP])
 AC_COMPILE_IFELSE(
        [AC_LANG_SOURCE([[
+                       #include <linux/mount.h>
                        #include <sys/mount.h>
       int foo = MOUNT_ATTR_IDMAP;
        ]])],