configure: new odfvalidator requires Java 8

Change-Id: Iaac1f13e6c189e2e13b86258268741c14a537799
diff --git a/configure.ac b/configure.ac
index d0ecde9..51f336a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2015,7 +2015,7 @@ AC_ARG_WITH(export-validation,
    AS_HELP_STRING([--without-export-validation],
        [Disable validating OOXML and ODF files as exported from in-tree tests.
         Use this option e.g. if your system only provides Java 5.]),
,with_export_validation=yes)
,with_export_validation=auto)

AC_ARG_WITH(bffvalidator,
    AS_HELP_STRING([--with-bffvalidator=<absolute path to BFFValidator>],
@@ -7038,9 +7038,19 @@ dnl ===================================================================
dnl Export file validation
dnl ===================================================================
AC_MSG_CHECKING([whether to enable export file validation])
if test "$with_export_validation" = yes; then
if test "$with_export_validation" != "no"; then
    if test -z "$ENABLE_JAVA"; then
        AC_MSG_RESULT([no, as Java is disabled])
        if test "$with_export_validation" = "yes"; then
            AC_MSG_ERROR([requested, but Java is disabled])
        else
            AC_MSG_RESULT([no, as Java is disabled])
        fi
    elif test "$_jdk_ver" -lt 10800; then
        if test "$with_export_validation" = "yes"; then
            AC_MSG_ERROR([requested, but Java is too old, need Java 8])
        else
            AC_MSG_RESULT([no, as Java is too old, need Java 8])
        fi
    else
        AC_MSG_RESULT([yes])
        AC_DEFINE(HAVE_EXPORT_VALIDATION)
@@ -7112,7 +7122,7 @@ AC_MSG_CHECKING([for Microsoft Binary File Format Validator])
if test "$with_bffvalidator" != "no"; then
    AC_DEFINE(HAVE_BFFVALIDATOR)

    if test "$with_export_validation" != "yes"; then
    if test "$with_export_validation" = "no"; then
        AC_MSG_ERROR([Please enable export validation (-with-export-validation)!])
    fi