Fix for compiling on Solaris

[bill rushmore]

I have a very simple patch for Makefile.rules that solves the problem of 
trying to build on Solaris.  The issue is that Solaris' gcc uses the 
Solaris linker and that linker doesn't have the --gc-sections flag.  
This patch fixes Bug 18517.

Bill Rushmore
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Index: Makefile.rules
===================================================================
--- Makefile.rules	(revision 230649)
+++ Makefile.rules	(working copy)
@@ -637,8 +637,8 @@
 ifndef NO_DEAD_STRIP
   ifeq ($(HOST_OS),Darwin)
     LD.Flags += -Wl,-dead_strip
-  else
-    ifneq ($(HOST_OS), $(filter $(HOST_OS), Cygwin MingW))
+  else	
+    ifneq ($(HOST_OS), $(filter $(HOST_OS), Cygwin MingW SunOS))
       LD.Flags += -Wl,--gc-sections
     endif
   endif