thp02: Add autoconf check for MREMAP_FIXED

The MREMAP_FIXED may not exist in sys/mman.h.

Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
diff --git a/configure.ac b/configure.ac
index 35e1850..1696df0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -165,5 +165,6 @@
 LTP_CHECK_MADVISE
 LTP_CHECK_ACL_SUPPORT
 LTP_CHECK_FS_IOC_FLAGS
+LTP_CHECK_MREMAP_FIXED
 
 AC_OUTPUT