MFC r266728,266731,266735,266736,268135,268960,269833
Update apr 1.4.8 -> 1.5.1
Update apr-util 1.5.2 -> 1.5.3
Update serf 1.3.4 -> 1.3.7
Update svnlite 1.8.8 -> 1.8.10
Deal with svnlite.1 manpage.

MFC r262324: serf 1.3.4 - improve SSL handling with svn-1.8.8 and other
speedups and quality of life fixes.

MFC r266728,266731,266735,266736,268135,268960,269833
Update apr 1.4.8 -> 1.5.1
Update apr-util 1.5.2 -> 1.5.3
Update serf 1.3.4 -> 1.3.7
Update svnlite 1.8.8 -> 1.8.10
Deal with svnlite.1 manpage.

MFC r262324: serf 1.3.4 - improve SSL handling with svn-1.8.8 and other
speedups and quality of life fixes.