Varnishncsa %D format option is now in microseconds.
Add manual Provides for libvarnishapi.so.1.

find-provides did not pick up on libvarnishapi.so.1 for varnish-libs
automatically, and find-requires for the main package did. This meant
that package pair was uninstallable.

I don't quite know why this is happening, so I'm working around it
with a hardcoded Provides for now. This is on the critical path for
4.0 release.
Amending 6dc740f with additional Provides.

As Ingar mentions in #1445, this is a workaround for the
dependency issue.

Originally attempt at a shorter fix in 6dc740f didn't work out.
Use -p to pass parameters, -w is long gone
Use jemalloc again.

Since we removed the bundled jemalloc, our packages have been
using system malloc on RHEL Linux.
Harmonise default storage across distributions.

The standard storage in our other Linux packages is 256 MB malloc.

Change the default on Redhat systems to match this.