The ecjsrc.jar holds now MANIFEST.MF from scripts/binary/META-INF. The
binary manifest is used when building up ecj.jar from ecjsrc.jar.

The patch fixes also an exception thrown from
Properties$LineReader.readLine(...) caused by missing
readableNames.props file. The file was not copied to the built jar.

Bug: 374724
Change-Id: I8dd31f6ab5cdca8dd93b3ea9e5147ce9e4ee049c