Remote whitespace at the ends of lines. Remove blank lines from the ends of files. Change modes on source files so that they are not executable. Signed-off-by: Dan Cross <cross@gajendra.net>

Both `upas/nfs` and `upas/smtp` call the currently broken `tlsClient()` from libsec. This commit copies a fix from upas/nfs into upas/smtp. In `imapdial()`, upas/nfs replaces a process call for tlsClient with `stunnel3` when not on Plan 9. upas/smtp calls tlsClient directly as a function, so imapdial was copied into mxdial.c as `smtpdial()`, and tlsClient+dial replaced with a call to smtpdial.

R=rsc https://codereview.appspot.com/92650043

smtp.c:232: warning: comparison with string literal results in unspecified behavior smtp.c:244: warning: comparison with string literal results in unspecified behavior marshal.c:1179: warning: variable ‘err’ set but not used LGTM=rsc R=rsc https://codereview.appspot.com/93290043

R=rsc CC=plan9port.codebot http://codereview.appspot.com/4967049