Fix compilation on SunOS

This came up when I was testing if building on SunOS still works
on the buildbot's instance of OmniOS r151014 which is based on illumos.

The fix is
 - to link against libnsl
 - a small C type fix in ich_descriptor_tool

Corresponding to flashrom svn r1950.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/Makefile b/Makefile
index 927105d..f94ec7b 100644
--- a/Makefile
+++ b/Makefile
@@ -926,7 +926,7 @@
 
 ifneq ($(NEED_POSIX_SOCKETS), )
 ifeq ($(TARGET_OS), SunOS)
-LIBS += -lsocket
+LIBS += -lsocket -lnsl
 endif
 endif