libreadline-java: Fix for Linuxbrew
libreadline-java: Fix for Linuxbrew

Fix error:
  fatal error: jni_md.h: No such file or directory

Additionally, don't use install_name_tool and don't change file
extensions from so to jnilib

Closes Linuxbrew/homebrew-core#1409.

Signed-off-by: Bob W. Hogg <c772a964fd55352a3510e5d535dd9ccc9ac30168@linux.com>

rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,maxim-belkin/homebrew-core,maxim-belkin/homebrew-core,Linuxbrew/homebrew-core,LinuxbrewTestBot/homebrew-core,Linuxbrew/homebrew-core,rwhogg/homebrew-core