[Patch] Fix for build break for alpha

[M. Warner Losh]

In message: <002701c45f7a$f5a31110$5adea1d3 at fareast.corp.microsoft.com>
            "csj" <junsu at delphij.net> writes:
: I noticed the build is break in the alpha due to 1.21 reversion of rman.h. In my config, I manually added the #define __RMAN_RESOURCE_VISIBLE into the following files:

Typically this is the wrong fix.  These files should be updated to not
poke around in struct resource.  I'm working on that.

However, Andrew already committed very similar patch.

Warner