Update prebuilt signapk to #2548715 aosp-master-linux-full-eng.

The Darwin conscrypt_openjdk_jni shared library is from
aosp-master-mac-sdk #2548715 build.

This update rolls up the following major changes from
build/tools/signapk:
* 8502937cff58c036a2ac05671e1e46d1cbb46425: List SHA-1 digests of
  APK entries' contents in .SF files.
* c2c49ed0c13846f7f96249c7419971dfcddc9215: Unconditionally use
  SHA-256 when minSdkVersion is 18 or higher.
* 9b54a565c9ffd1e8ed0c3434ede022d9501eaa80: Command-line flag to
  disable signing with APK Signature Scheme v2.

Bug: 25643280
Bug: 26513901
Bug: 25794543
Change-Id: I178c344189d927fafa3c3d5a139301e8bbd44f4d
3 files changed