Solve two ssl issues; always install both ab.exe and abs.exe

Solve two ssl issues; always install both ab.exe and abs.exe
because it's easier to move around ab.exe when that's all
someone needs (and this is precisely how the binary installer
works, too), and also kindly ignore missing openssl tree files
because TIMTOWTDI (although this one is preferred :)

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@606382 13f79535-47bb-0310-9956-ffa450edef68