Install multiple files per install.sh invocation

Libtool and BSD install support installing several files in one run.
Add support to install.sh and instdso.sh, too.
Replace for-loops in the Makefiles.

This reduces 'make install' time by approx. 50% because we save
lots of calls to the huge libtool shell script.

The AIX-specific magic in instdso.sh could use some testing.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1237447 13f79535-47bb-0310-9956-ffa450edef68