If asked to do so, enable icecream even in the 'build' part of configure.

Otherwise it is used only in the 'host' part of the cross-compile build.

Change-Id: Ifb8d88e18c131e3019a4f3168afc1b743f3cc8e0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/88486
Tested-by: Jenkins
Reviewed-by: Andras Timar <andras.timar@collabora.com>

configure.ac

@@ -4791,6 +4791,7 @@ if test "$cross_compiling" = "yes"; then
         --disable-gtk3 \
         --disable-pdfimport \
         --disable-postgresql-sdbc \
+        --enable-icecream="$enable_icecream" \
         --with-parallelism="$with_parallelism" \
         --without-doxygen \
         --without-java \