d4b1d9b755 "sb123: #i111655# when, within build
env, calling javaldx within OOo installation sets, set UNO_JAVA_JFW_ENV_JREHOME,
but not UNO_JAVA_JFW_ENV_CLASSPATH" had removed the
-env:UNO_JAVA_JFW_ENV_CLASSPATH=true
arg, but 8c59580b88 "Merge commit
'ooo/DEV300_m101' into integration/dev300_m101", in what looks like an
accidental mis-merge, brought it back
Change-Id: If2313642a1a737c9711fb36dcab5c340bf7dcecb
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/88133
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>