Added the "install" target.
Added the "install" target.

Because the default "install" target installs ALL including the
executables under the "tests" directory. The new target hides this.

SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2,SumiTomohiko/fsyscall2