VMS: use BLDDIR rather than BUILDDIR in descrip.mms.tmpl
VMS: use BLDDIR rather than BUILDDIR in descrip.mms.tmpl

Just like in the other build file templates

Reviewed-by: Rich Salz <c04971a99e5a9ee80eaab4b1deb37e845b0bd697@openssl.org>

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl