micro-optimization: do not check for ant if we don't need it

Change-Id: I84644cddd8a318a2af23780ada9afc26fe23a9fe
Reviewed-on: https://gerrit.libreoffice.org/54719Tested-by: Jenkins <ci@libreoffice.org>
Tested-by: Rene Engelhard <rene@debian.org>
Reviewed-by: Rene Engelhard <rene@debian.org>

configure.ac

@@ -8503,6 +8503,7 @@ if test "$with_java" != "no"; then
         AC_MSG_RESULT([internal])
         SYSTEM_HSQLDB=
         BUILD_TYPE="$BUILD_TYPE HSQLDB"
+        NEED_ANT=TRUE
         AC_MSG_CHECKING([whether hsqldb should be built with JDBC 4.1])
         javanumver=`$JAVAINTERPRETER -version 2>&1 | $AWK -v num=true -f $SRC_ROOT/solenv/bin/getcompver.awk`
         if expr "$javanumver" '>=' 000100060000 > /dev/null; then
@@ -10617,6 +10618,7 @@ if test "$enable_report_builder" != "no" -a "$with_java" != "no"; then
         AC_MSG_RESULT([internal])
         SYSTEM_JFREEREPORT=
         BUILD_TYPE="$BUILD_TYPE JFREEREPORT"
+        NEED_ANT=TRUE
     fi
 else
     AC_MSG_RESULT([no])
@@ -10660,6 +10662,7 @@ if test "$ENABLE_REPORTBUILDER" = "TRUE"; then
         AC_MSG_RESULT([internal])
         SYSTEM_APACHE_COMMONS=
         BUILD_TYPE="$BUILD_TYPE APACHE_COMMONS"
+        NEED_ANT=TRUE
     fi
 fi
 AC_SUBST(SYSTEM_APACHE_COMMONS)
@@ -10722,6 +10725,7 @@ if test "${enable_scripting_javascript}" != "no" -a "x$with_java" != "xno"; then
         AC_MSG_RESULT([internal])
         SYSTEM_RHINO=
         BUILD_TYPE="$BUILD_TYPE RHINO"
+        NEED_ANT=TRUE
     fi
 else
     AC_MSG_RESULT([no])
@@ -11650,7 +11654,7 @@ dnl ===================================================================
 dnl Test for the presence of Ant and that it works
 dnl ===================================================================
 
-if test "$ENABLE_JAVA" != ""; then
+if test "$ENABLE_JAVA" != "" -a "$NEED_ANT" = "TRUE"; then
     ANT_HOME=; export ANT_HOME
     WITH_ANT_HOME=; export WITH_ANT_HOME
     if test -z "$with_ant_home" -a -n "$LODE_HOME" ; then