configure.ac: loader/preloader.c is Linux specific, don't build it elsewhere

[Austin English]

Wine doesn't work on k-freebsd, but enabling the preloader breaks the
compile. See also bug 20314.

-- 
-Austin
-------------- next part --------------
diff --git a/configure.ac b/configure.ac
index a6daf78..f6ac893 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1659,7 +1659,7 @@ test -z "$with_wine64" || MAIN_BINARY="wine32"
 case $host_cpu in
   *i[[3456789]]86*)
     case $host_os in
-      linux* | k*bsd*-gnu)
+      linux*)
         AC_SUBST(EXTRA_BINARIES,"wine-preloader") ;;
     esac
     ;;