modify top-level lnet/include/libcfs/libcfs.h,kp30.h,portals_utils.h
files to conditionally include header files for solaris port.
create Solaris port files and shared posix-*.[ch] files for both
Linux and Solaris ports.
The posix-*.[ch] files are currently noop
(posix threads API calls should be added there).
LB_LINUX_CONDITIONALS
LB_DARWIN_CONDITIONALS
-LB_SUNOS_CONDITIONALS
+# LB_SUNOS_CONDITIONALS
LN_CONDITIONALS
LC_CONDITIONALS