Revert "HACK for libjavacore's tricky conscrypt JNI_OnLoad"

This reverts commit 0b23fc421bbc9577bc0f4cf94032f80aed1e7477.

Conflicts:
	config/common.mk
Revert "(3/3) use two prebuilts for libjavacore"

This reverts commit 97177e7f4ba470d68389b1a4ccab43ec09842f51.
config: common: yank cfx_version shit