Mac OS X. 2. Reordered the Mac code in pr_LoadLibraryByPathName to try loading various kinds of shared libraries in the order of most likely success. The patch is contributed by Conrad Carlen <ccarlen@netscape.com>. r=wtc. sr=sfraser. git-svn-id: svn://10.0.0.236/trunk@136342 18797224-902f-48f8-a5cc-f745e15eee43