Dead code removal in client/src (#51)

* Update style checker to support four-space indent

Update checkpatch.pl to support four-space indentation since that
is the convention used in this project. Otherwise we get false
warnings like this:

 WARNING: suspect code indent for conditional statements (8, 12)
 #310: FILE: client/src/unifycr-stdio.c:2523:
 +        if (p > buf) {
              (void) ungetc(*(u_char *)--p, (FILE *)fp);

* Clean up dead code in client/src/unifycr-stdio.c

Remove commented out code blocks and fix a few code formatting
issues in client/src/unifycr-stdio.c. This is to improve code
readability.

* Clean up dead code in client/src/unifycr.c

Remove commented out code in client/src/unifycr.c to improve
readability. This leaves behind stubbed out functions that
presumably need to be implemented. We will open github issues
to track that work and link to this commit in case the removed
code is needed for reference.