[Rd] loading library from network share (PR#8982)

[roy_kuraisa at merck.com]

Full_Name: roy kuraisa
Version: 2.2.1
OS: Windows XP SP2
Submission from: (NULL) (155.91.28.232)


When loading a library from network share drive (e.g., \\nnn\f1\f2\p1), when
First.lib is called, the libray name contains "/" instead of "\" resulting in an
invalid Windows filepath.

Here's an example:
>From R,
> library(foo.lib="\\\\kodak\\research_genetics\\rlibs");
Within First.lib,
.First.lib <-function(lib, pkg)
{
    cat("lib name ",lib,"\n")
}
produces the output
   lib name //kodak/research_genetics/rlibs