mdbx-test: add Valgrind-suppressions for bcmp/memcmp of page-check inside mdbx_iov_write().

Related to https://github.com/erthink/libmdbx/issues/269.

test/valgrind_suppress.txt

@@ -31,6 +31,20 @@
    fun:mdbx_wipe_steady
 }
 
+# memcmp() inside mdbx_iov_write() as workaround for https://github.com/erthink/libmdbx/issues/269
+{
+   write-page-check-bcmp
+   Memcheck:Cond
+   fun:bcmp
+   fun:mdbx_iov_write
+}
+{
+   write-page-check-memcmp
+   Memcheck:Cond
+   fun:memcmp*
+   fun:mdbx_iov_write
+}
+
 # single-page flush by pwrite()
 {
    pwrite-page-flush