SOLARIS can use/should use posix_madvise under certain conditions.

Change-Id: Idc40752b4beee932b5912e6df9fe6acb15571201
Signed-off-by: Michael Stahl <mstahl@redhat.com>

sal/osl/unx/file.cxx

@@ -1171,7 +1171,7 @@ SAL_CALL osl_mapFile (
         // OS simultaneously pages in the rest); on other platforms, it remains
         // to be evaluated whether madvise or equivalent is available and
         // actually useful:
-#if defined MACOSX
+#if defined MACOSX || ( defined(SOLARIS) && ( !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__) ) )
         int e = posix_madvise(p, nLength, POSIX_MADV_WILLNEED);
         if (e != 0)
         {