The RequiresSetenv in the unix version of java_md.c has code of the form:

if (llp == NULL && dmllp == NULL) {

and

if (dmllp != NULL && ContainsLibJVM(dmllp)) {
        return JNI_TRUE;
}

The dmllp is a local variable in that function, which never set to a non-null value:

char *dmllp = NULL;

Effectively there is some dead code in that function.

I suspect this is a left-over from the data model selection removal that was done as part of https://bugs.openjdk.org/browse/JDK-8244224.