Fix build on Solaris 11.

Patch by Vladimir Voskresensky. The erros were:

Path.inc:274:3: error: ‘Dl_info’ was not declared in this scope
...

and

usr/include/spawn.h:52:14: error: expected ‘,’ or ‘...’ before ‘argv’

llvm-svn: 192185
diff --git a/llvm/lib/Support/Unix/Program.inc b/llvm/lib/Support/Unix/Program.inc
index 2822e91..78b2971 100644
--- a/llvm/lib/Support/Unix/Program.inc
+++ b/llvm/lib/Support/Unix/Program.inc
@@ -36,6 +36,9 @@
 #include <unistd.h>
 #endif
 #ifdef HAVE_POSIX_SPAWN
+#ifdef __sun__
+#define  _RESTRICT_KYWD
+#endif
 #include <spawn.h>
 #if !defined(__APPLE__)
   extern char **environ;