This prevents building libmingwthrd.a, so that we can install enough of mingw32
to support building gcc.

created by Nathan Coulson <conathan@gmail.com>

diff -Naur mingwrt-3.18-mingw32.orig//Makefile.in mingwrt-3.18-mingw32/Makefile.in
--- mingwrt-3.18-mingw32.orig//Makefile.in	2010-02-14 19:16:19.000000000 -0800
+++ mingwrt-3.18-mingw32/Makefile.in	2010-09-09 23:58:57.878731712 -0700
@@ -247,11 +247,9 @@
        libmoldname71.a libmoldname71d.a \
        libmoldname80.a libmoldname80d.a \
        libmoldname90.a libmoldname90d.a \
-       $(LIBM_A) \
-       libmingwthrd_old.a \
-       libmingwthrd.a
+       $(LIBM_A)
 
-DLLS = $(THREAD_DLL_NAME)
+DLLS =
 
 INSTDOCS = CONTRIBUTORS \
 	   DISCLAIMER \