Makefile: define __sun__ on SunOS
Makefile: define __sun__ on SunOS

The SUNWspro compiler does not define __sun__ (like GCC does).  A check of
this macro was recently added to detect compilation on SunOS and to modify
the handling of the NO_ICONV and _XOPEN_SOURCE feature macros.

Signed-off-by: Brandon Casey <8846602a89ca53d44af0c0033a3c79dc5d05ea84@gmail.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git