Move any load library path environment variables out of

Move any load library path environment variables out of
apachectl and into a separate environment variable file which
can be more easily tailored by the admin.  The environment
variable file as built by Apache may have additional system-
specific settings.  For example, on OS/390 we tailor the heap
settings to allow lots of threads.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92490 13f79535-47bb-0310-9956-ffa450edef68